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.

Category: CAPTURE THE FLAG 
Clue: Afghanistan's flag has a mosque in a wreath made of stalks of this grain
wheat

Category: NATIONAL GEOGRAPHIC 
Clue: The Vogalonga, an annual regatta seen here, takes place in this city
venice

Category: BEASTLY EXPRESSIONS 
Clue: This term for the most sultry part of summer come from the Latin "dies caniculares"

the dog days