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: THEIR FIRST FEATURE FILMS 
Clue: June Lockhart debuted as a Cratchit child in this 1938 film, with her real parents playing Mr. & Mrs. Bob Cratchit
answer:
a christmas carol


question:
Category: HEAVY MACHINERY 
Clue: By definition it's a machine that gives a surface an even degree of slope
answer:
grader


question:
Category: LIVING IN "SIN" 
Clue: One of his 7 voyages took him to Serendib
answer:

sinbad