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: ANIMALS 
Clue: These mollusks, not oysters, are the most common source for freshwater pearls

Answer: mussels


Question: Category: '50s TV 
Clue: In "Have Gun, Will Travel", Richard Boone played this dapper gun-for-hire based in San Francisco's Hotel Carlton

Answer: paladin


Question: Category: WORD ORIGINS 
Clue: This noun from the Italian for "skilled" is often applied to top musicians

Answer:
virtuoso