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: DIGESTION 
Clue: This substance in your food slows down the digestive process & is what bile works on

Answer: fat


Question: Category: SCIENCE 
Clue: This yellow element is found in gunpowder & matches & is used in vulcanizing rubber

Answer: sulphur


Question: Category: THE 5th BEATLE 
Clue: This Beatles producer started out making comedy records with Peter Sellers

Answer:
george martin