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: MOZART & FRIENDS 
Clue: Mozart wrote a lovely motet for Venanzio Rauzzini, one of these specially treated singers

Answer: a castrato


Question: Category: FAMOUS FACES 
Clue: This Englishman's detailed & highly popular novels examined 19th century social conditions

Answer: charles dickens


Question: Category: COUNTIES OF ENGLAND 
Clue: The westernmost county of England, or what the eldest son of the monarch is duke of

Answer:
cornwall