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: FROM B TO C 
Clue: A group of nations acting together, like the old Soviet one

Answer: bloc


Question: Category: BIOGRAPHIES 
Clue: Noel Riley Fitch cooked up a fine biography of this "French Chef" called "Appetite for Life"

Answer: julia child


Question: Category: SHE INVENTED WHAT? 
Clue: Rachel Brown & Elizabeth Hazen invented nystatin, an anitbiotic used on people & on this "Dutch" tree disease

Answer:
dutch elm disease