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: RELIGION 
Clue: Some 3 million pilgrims visit this small French town annually

Answer: lourdes


Question: Category: OPTICS 
Clue: On New Year's or any other day, it's the fineness of detail that can be distinguished in a photographic image

Answer: resolution


Question: Category: STARTING HERE 
Clue: In New York City on October 1, 1999 I rang the opening bell to start this

Answer:
new york stock exchange