Three people, A, B and C, go to the restaurant for dinner every day. A, B and C go to a restaurant for dinner every day. They want ham or pork chop. 1. If Party A wants ham, then Party B wants pork chops. Party A or Party C wants ham, but not both. 3. Not all B and C want pork chops. Who ordered ham yesterday and pork chop today?

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Correct answer: B.

According to 1 and 2, if A wants ham, then B wants pork chops, which contradicts 3. Therefore, A can only eat pork chops. So according to 2, all C wants is ham. So only B can eat ham yesterday and pork chop today.