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.
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Question: Category: THE 16th CENTURY 
Clue: In the 1569 Union of Lublin, Zygmunt II united Lithuania & this country

Answer: poland


Question: Category: '60s ROCK 
Clue: In July 1967 this group's "Light My Fire" became Elektra Records' first No. 1 single

Answer: the doors


Question: Category: GETTIN' CATTY 
Clue: Members of this cat breed seen here aren't really blue, comrade, nor do they have to be from Moscow

Answer:
russian blue