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: HOSPITALS 
Clue: The Cleveland Clinic tops U.S. News' 1996 ranking of hospitals in this, the study of the heart

Answer: cardiology


Question: Category: OPERAS BASED ON PLAYS 
Clue: "The Queen of Cornwall", from a play by this author, premiered "Far from the Madding Crowd", in Glastonbury

Answer: thomas hardy


Question: Category: BAYS 
Clue: During one tide cycle, more than 100 billion tons of seawater flow in & out of this bay between N.B. & Nova Scotia

Answer:
the bay of fundy