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.
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Question: Category: CLOTHING
Clue: They can be crew, knee, or bobby

Answer: socks

Question: Category: HISTORIC EUROPEAN LEADERS
Clue: On June 15, 1961 Walter Ulbricht assured journalists that "No one intends to build a wall" dividing this city

Answer: berlin

Question: Category: ENGLISH ROYALTY
Clue: Queen Elizabeth's husband, Prince Philip, is a son of the royalty of this country where he was born

Answer:
greece