While grapefruit juice is a healthy

Answer choices

1. A

   Correct86% picked this

   The amount of the chemical in grapefruit juice is highly unpredictable from

   Why this is right

   This plan to do low dose + grapefruit juice probably won't work, because .... the variable rate of the supercharging chemical will make it too hard to dose properly. If one day you take your heart medicine + 6 oz of grapefruit juice and there happens to be 10mg of the medicine-boosting chemical, that will give you a very different medicinal effect then if the following day you take your heart medicine + 6 oz of grapefruit juice and there happens to be 20mg of the chemical. That extra chemical concentration could create dangerous dosing (if there's too much of the chemical) or ineffective dosing (if there's too little of the chemical).

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

   86%
2. B

   Strengthens, if Anything0% picked this

   Grapefruit juice is less expensive than most of the medicines with

   The fact that the grapefruit juice is cheaper than the medicine almost has no effect, but if anything it would make this plan seem more feasible.

   0%
3. C

   No Impact4% picked this

   When scientists removed the chemical from grapefruit juice, the juice no longer affected how certain

   This answer if anything strengthens the idea that the chemical is the causal difference-maker. When we remove it, the augmenting effect disappears. But this was never in doubt. This was part of the background evidence that we're already accepting.

   4%
4. D

   No Impact5% picked this

   The chemical in grapefruit juice works by inhibiting an enzyme in the body that affects how

   This just tells us how it is that the chemical in grapefruit juice augments medicinal strength. We don't really care about the specifics of how it does it. We only care about whether it seems wise to adopt a policy of pairing lower doses with a side of grapefruit juice.

   5%
5. E

   No Impact5% picked this

   Long before the chemical in grapefruit juice was identified, doctors were advising patients who took certain medicines

   The past status of what doctors used to say isn't really relevant to our current understanding about this chemical and the current plan under consideration. Until we discovered the chemical in grapefruit juice that was messing up medications, doctors probably had anecdotes about grapefruit juice messing things up and didn't know why but warned their patients to stay away from it. But now that we understand the chemical, this answer wouldn't really be relevant any more.

   5%