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.

[Q]: Category: LIBRARIES 
Clue: Samuel Pepys' famous diary is housed at the Pepysian Library at Magdalene College at this university
[A]: cambridge


[Q]: Category: BRAND "O" 
Clue: You can read "Story O's" about this cookie on its website
[A]: oreos


[Q]: Category: SCIENCE & NATURE 
Clue: Hermann Muller won a 1946 Nobel Prize for proving that the use of these can cause mutations
[A]:
x rays