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: EMPERORS 
Clue: After becoming emperor of Ethiopia in 1930, he gave the country its first written constitution

Answer: haile selassie


Question: Category: GENERAL SCIENCE 
Clue: A horse's hooves are made up of this protein, the same protein found in your fingernails

Answer: keratin


Question: Category: COLLEGE TOWNS 
Clue: Carnegie Mellon University

Answer:
pittsburgh