Passage Summary: People think eating chocolate gives them pimples, but it's actually stress that causes both the pimples and the urge to eat chocolate.

Conclusion: The popular belief that chocolate causes acne likely confuses an effect of a underlying cause with the cause itself.

Reasoning: Scientific evidence suggests that stress causes both acne and an increased craving for chocolate, meaning chocolate consumption and acne are both effects of stress.

Analysis: The main conclusion is signaled by the pivot word 'However,' which introduces the author's rebuttal to the 'common wisdom' mentioned in the first sentence. The sentences following the conclusion provide the evidence—specifically the role of stress—to explain why the common belief is mistaken. When identifying the conclusion, focus on the author's primary claim rather than the scientific premises used to support that claim. The author isn't just talking about stress; they are using stress to prove that the chocolate-acne link is misunderstood.