TASK DEFINITION: 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.
PROBLEM: Category: JOG-RAPHY 
Clue: Popular name of the tough section of the Boston Marathon course seen here

SOLUTION: "heartbreak hill"

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

SOLUTION: thomas gainsborough

PROBLEM: Category: SCIENCE & NATURE 
Clue: Like an escargot, the abalone is an edible one of these gastropods

SOLUTION:
a snail