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.
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Question: Category: ANIMAL PLANET? 
Clue: In gymnastics, it's safe to vault over; its body is upholstered

Answer: horse


Question: Category: TELEVISION 
Clue: Ray Walston was the Martian while the "my" in "My Favorite Martian" referred to him

Answer: bill bixby


Question: Category: POPES NAMED GREGORY 
Clue: Gregory XIII is famous for his revision of this in 1582

Answer:
the calendar