You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
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Question: Category: FOOD 
Clue: A popular health food, this soybean curd is used to make a variety of dishes & an ice cream substitute

Answer: tofu


Question: Category: THE 1970s 
Clue: In 1977 Bank of America changed the name of its Bank Americard to this 4-letter word

Answer: visa


Question: Category: PLAYING DOCTOR 
Clue: Dr. Harry Weston on "Empty Nest"

Answer:
richard mulligan