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 consistency, answers should be in all lower cased letters.
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Question: Category: A CAST OF THOUSANDS 
Clue: It's what you're trying to catch when you're fly-casting

Answer: fish


Question: Category: "OID" VEY 
Clue: Because it carries 2 sets of chromosomes, a zygote is this type of cell

Answer: diploid


Question: Category: THE BEATLES 
Clue: This 1964 film, the Beatles' first, received an Oscar nomination for its musical score

Answer:
a hard day\'s night