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: PHOTOGRAPHERS 
Clue: In April 1875 the Library of Congress gained possession of his Civil War photographic plates for $25,000

A: mathew brady
****
Q: Category: OH, THE HUMANITIES! 
Clue: Bach did most of his composing for this Protestant denomination

A: lutheran
****
Q: Category: WORLD CURRENCY 
Clue: This Angolan currency introduced in 1977 was named for a river, not a late December holiday

A:
kwanzaa
****