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: THE CALENDAR 
Clue: Civilization that produced the first known calendar with 365 days
ancient egypt

Category: HISTORIC BOOKS 
Clue: It was written in 1924 in the fortress of Landsberg am Lech
mein kampf by adolf hitler

Category: U.S. STATES 
Clue: The only U.S. state that borders 4 Great Lakes

michigan