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 consistency, answers should be in all lower cased letters.
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Question: Category: READ THE FOOD LABEL 
Clue: The daily values are based on a diet of 2,000 or 2,500 of these a day

Answer: calories


Question: Category: CURRENT EXPRESSIONS 
Clue: If you're engaging in wishful thinking, you may want to perform this type of "check"

Answer: a reality check


Question: Category: RANKS & TITLES 
Clue: As one of these enlisted ranks in the army, your grade is E-1 or E-2; as a first class one, it's E-3

Answer:
private