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: 20th CENTURY NOVELS 
Clue: Manfred de Spain appears in "The Town", "The Mansion" & "The Reivers" by this author
faulkner

Category: HAY IS 
Clue: ...Animal fodder made from cereal grasses like this one, also the first name of the current treasury secretary
timothy

Category: DECADE OF DISCOVERY 
Clue: Americium (atomic number 95)

the 1940s