Problem: Given the question: Mike and John are brothers. Their dad sent them to the doctor's office to get tested for hepatitis because Mike was feeling sick all the time. It turned out Mike has hepatitis B, while John doesn't. Which brother has a greater chance of getting liver cancer?
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The answer is:
Mike

Problem: Given the question: Ben and Mike both studied earthquakes, while Mike was more interested specifically in mantle melting and related phenomena. Which person studied less about the three ways of mantle melting?
++++++++++++++++++++++++++++++++
The answer is:
Ben

Problem: Given the question: Tom and Andy are two old friends. Tom was infected with HIV 20 years ago, and Andy has been helping him ever since. Andy is as healthy as an ox. Which friend has a stronger immune system?
++++++++++++++++++++++++++++++++
The answer is:
Andy