Logical ReasoningDifficulty: Easy

PT127 S1 Q1 Explanation

Many newborn babies have a yellowish

A free, expert breakdown of this official LSAT Logical Reasoning question.

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Stimulus

Many newborn babies have a yellowish tinge to their skin because their blood contains a high level of the pigment bilirubin. One group of doctors treats newborns to reduce high levels of bilirubin, since bilirubin, if it enters the brain, might cause the tetanus that sometimes occurs in newborns. However, a second high, since the brain’s own natural defenses normally prevent bilirubin from entering.

What this question is testing

Strengthen

Your task

Find the choice that makes the argument's conclusion more likely to be true.

Common trap

Answers that are consistent with the argument but add no real support, or that strengthen a claim the argument doesn't make.

Winning move

Locate the gap between evidence and conclusion, then pick the choice that closes it.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
1.

Which one of the following, if true, most helps to support the position of the second

Answer choices

  1. Weakens2% picked this

    The treatment that most effectively reduces high levels of bilirubin in newborns has no known

    This says something good about the plan to get rid of bilirubin. We're trying to help out the doctors who are saying don't try to get rid of bilirubin. If there were an answer saying, "after all, the treatment to reduce high bilirubin has a lot of negative side effects", that would strengthen the position we're trying to support.

  2. Weakens2% picked this

    Some diseases that occur in newborns can weaken the brain’s natural defenses and allow

    This says something bad about the plan to leave the high bilirubin inside the newborns. The 2nd group of doctors was not too worried about bilirubin getting into the brain and doing damage, but this answer reminds them that there is some danger of the bilirubin getting into the brain. After all, some disease weaken the brain's natural defenses, so those children would be vulnerable.

  3. No Impact2% picked this

    In newborns the pigment bilirubin, like other pigments, occurs not only in the blood but also in

    This just tells us that bilirubin is not only in blood, it's also in digestive juices. That has no effect on this conversation. That's not a reason to reduce high bilirubin nor is it a reason to leave it in the new borns.

  4. Correct93% picked this

    Bilirubin neutralizes certain potentially damaging substances to which newborns are exposed

    Why this is right

    This says something good about the plan to leave the bilirubin inside of the newborns. This is saying that we get a benefit by leaving it in there; it neutralizes potentially damaging substances to which newborns are exposed. So this 2nd group of doctors can say, "the downside of leaving bilirubin in is very small, since it's only scary if it gets into the brain and the brain normally prevents that from happening. Meanwhile the upside of leaving bilirubin in is compelling, because the bilirubin can protect the newborns against damaging substances they're exposed to at birth.

    Skill tested: Strengthen · how this choice captures the argument's function is the move to repeat next time.

  5. Weakens, if anything2% picked this

    Among doctors who recommend treating newborns to reduce high levels of bilirubin, there is general agreement about what levels

    Since this is about the 1st group of doctors (the ones who want to reduce high levels of bilirubin), it's not really relevant to the 2nd group whom we are trying to support. Perhaps if we said, "Doctors in the 1st group can't even agree on what constitutes high levels of bilirubin. Thus, we should listen to the 2nd group of doctors and just not worry about trying to reduce bilirubin", then this could strengthen our doctors' position. But since it's saying there is general agreement about what level should be considered too high, this actually helps the position of the 1st group of doctors, if anything.

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