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.

Q: Category: MEDICINE & HISTORY 
Clue: Montezuma's real revenge: a 1741 British expedition to conquer Mexico was devastated by this "colorful" disease

A: yellow fever
****
Q: Category: SIGNS & SYMBOLS 
Clue: Symbols of mystery, they're the mysterious doubles of the people who cast them

A: shadows
****
Q: Category: THE OLD WEST 
Clue: These last names of Springfield, Mass. gunmakers Horace & Daniel were very familiar to people in the Old West

A:
smith & wesson
****