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.

[EX Q]: Category: '60s ROCK 
Clue: In July 1967 this group's "Light My Fire" became Elektra Records' first No. 1 single
[EX A]: the doors

[EX Q]: Category: THE 16th CENTURY 
Clue: In the 1569 Union of Lublin, Zygmunt II united Lithuania & this country
[EX A]: poland

[EX Q]: Category: SCIENCE & NATURE 
Clue: The largest living reptile is probably the saltwater species of this animal, which may weigh more than a ton
[EX A]:
crocodile