Passage Summary: People who eat lots of beta-carotene-rich foods stay healthier over two decades, but people taking beta-carotene pills for a decade don't see any health benefits.

Reasoning: No reasoning (Fact Set).

Analysis: The paradox lies in the discrepancy between the health benefits of beta-carotene from food versus supplements. To resolve this, we need a difference between the two studies, such as the source of the nutrient (food vs. pill), the duration (24 years vs. 12 years), or the other nutrients present in food that might be missing in a supplement. Since this is an 'EXCEPT' question, the correct answer will be the one that fails to provide a relevant distinction or explanation for why the results differed. Don't be surprised if the 'EXCEPT' answer is a fact that applies equally to both groups, thereby explaining nothing.