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: "KING" OF THE TOP 40 
Clue: "It's Too Late" & "So Far Away" were 1971 hits for her

Answer: carole king


Question: Category: HISTORIC AMOURS 
Clue: He may have sired several of Lady Castlemaine's children; no wonder he was "The Merry Monarch"

Answer: charles ii


Question: Category: THE BRAIN 
Clue: Though the brain is only 2% of human body weight, it uses up to 25% of this in the blood

Answer:
oxygen