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: FAMOUS PAIRS 
Clue: Now meaning nearly identical, these 2 names were applied to rivals Handel & Bononcini in a 1720s British verse

Answer: tweedledum & tweedledee


Question: Category: STARRY NIGHT 
Clue: The helix nebula is in this constellation, whose "arm" holds 5 stars suggesting a water pitcher

Answer: aquarius


Question: Category: THE BRITISH ARE COMING! 
Clue: After Dustin Hoffman sleep-deprived himself for a "Marathon Man" scene, this co-star said, "Dear boy...try acting"

Answer:
sir laurence olivier