PT60.S1.Q7 - Psychologist: Research has shown that a weakened

mitrakhanom1

I still don't understand why answer choice E is wrong. My understanding is, iIf stress is a symptom of a weakened immune system, then wouldn't that mean that symptoms such as stress then lead to or cause the weakened immune system?

stress as a symptom---> weakened immune system

I don't understand how and why Jon explained it that a weakened immune system is the sufficient and stress is the necessary? And that the causal relationship is flipped.
http://7sage.com/lsat_explanations/lsat-60-section-1-question-07/

nye8870

Hey there @mitrakhanom1 by applying the term "symptom" to stress you are implying stress comes from a weakened immune system. By that logic all individuals with a weakened immune system experience stress. That is not what is needed. (C) is actually stronger of a statement than is necessary. It could have said: "the amount of stress someone experiences plays a role in their immune system." For the argument to hold, at minimum we need there to be a relationship between the two ideas. If we negate and say there is no relationship, then the argument becomes silly.