Logical ReasoningDifficulty: Hard

PT3 S4 Q4 Explanation

The mind and the immune system

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

TopicsMost Supported

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Stimulus

The mind and the immune system have been shown to be intimately linked, and scientists are consistently finding that doing good deeds benefits one’s immune system. The bone marrow and spleen, which produce the white blood cells needed to fight infection, are both connected by neural pathways to the brain. Recent research beneficial chemicals produced by the brain as a result of magnanimous behavior.

What this question is testing

Most Supported

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

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

The question
4.

The statements above, if true, support the

Answer choices

  1. Trap0% picked this

    Good deeds must be based on

    Too Strong (must) / Out of Scope (motives) We can infer that there's some overlap between good deeds and magnanimus behavior, but we can't infer what good deeds must be, nor do we have any info on motives that would let us make this inference.

  2. Trap1% picked this

    Lack of magnanimity is the cause of most

    Too Strong (most serious) / Unsupported Causal Relationship We have no info about the causes of most serious illnesses that would allow us to make this inference.

  3. Unsupported Causal Relationship / Scope (brain chemicals)15% picked this

    Magnanimous behavior can be regulated by the presence or absence of certain chemicals

    We have no info about what regulates magnanimous behavior or about brain chemicals that would allow us to make this inference.

  4. Correct73% picked this

    Magnanimity is beneficial to one’s own

    Why this is right

    What do we know abouf Magnanimity? It stimulates immune cells and is an example of something good for your immune system. Is that enough to support that it's beneficial to our own interests? Sure. You need some common sense to connect the dots between benefiting your immune system and benefitting you and your interests, but sometimes we need a little common sense to make a Most Supported answer work.

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

  5. Too Strong (radically) / Unsupported Causal Relationship11% picked this

    The number of white blood cells will increase radically if behavior

    We're told magnanimous behavior can stimulate the cells, but not that it could incerease the number of cells, and certainly not that it could do so radically if the behavior was consistent. That's too strong all around.

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