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: ART SUBJECTS 
Clue: Seen in sculpture, Eustache de St. Pierre & 5 other wealthy men made themselves hostages to free this city

Answer: calais


Question: Category: SCIENTISTS 
Clue: In 1543 he wrote, "Finally we shall place the sun himself at the center of the universe"

Answer: nicolaus copernicus


Question: Category: 2002 POP STARS 
Clue: In September 2002 she set a Billboard record with her first-ever single, jumping from its debut at No. 52 to No. 1

Answer:
kelly clarkson