The brains of identical twins are genetically identical. When only one of a pair of identical twins is a schizophreni...

Chloe June 24, 2023

Why B? Not C?

I didn't choose B because even if the answer were true there could still be other reasons for the smallness of certain parts of the brain. B: "The relative smallness of certain parts of the brains of schizophrenics is not the result of schizophrenia or of medications used in its treatment"

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Emil-Kunkin June 26, 2023

Hi, this question isn't asking for an answer that, if true, would be the only possible explanation. It's asking for something the author must assume for their argument to make sense. The author argues that since we see a correlation between the size of an area and a condition, that the size causes the condition.

This is a pretty dumb argument. Perhaps the condition causes the size. The author has wrongly assumed that there is no possibility that schizophrenia causes changes in the size of some areas.

This is a match for B.

We don't have any reason to think that the author agrees with C. They only tell us about a twin study, and that doesn't really rely on there not being a difference in overall grain size between twins and non twins