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: FEMALE SINGERS 
Clue: She's tied with Mariah Carey for most no. 1 hits by a female with 18: 12 as a member of a group & 6 as a solo act

Answer: diana ross


Question: Category: BALLET 
Clue: Feeling the need for ballets about American life, this dancer choreographed his first ballet in 1944

Answer: jerome robbins


Question: Category: ACTORS & THEIR ROLES 
Clue: Name shared by characters that Derek Jacobi played in a PBS miniseries & in Kenneth Branagh's film of "Hamlet"

Answer:
claudius