instruction:
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.
question:
Category: WORLD HISTORY 
Clue: He completed vols. 2 & 3 of Karl Marx's "Das Kapital"
answer:
friedrich engels


question:
Category: ART & ARTISTS 
Clue: An X-ray of his "Blue Boy" has revealed the figure of a small dog that was painted out
answer:
thomas gainsborough


question:
Category: IN THE BOOKSTORE 
Clue: She dedicated "Postcards from the Edge" to her brother Todd & her mother, Debbie Reynolds
answer:

carrie fisher