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: ANNIVERSARIES & FAREWELLS 
Clue: In 2009 it celebrated its 40th anniversary with a farewell tour of the British Isles, where it was built; today, it's in Dubai

Answer: the queen elizabeth ii


Question: Category: TEXAS 
Clue: The front of the state seal of Texas has 1 star & the back of the seal has 6 of these

Answer: flags


Question: Category: SPORTS CITIES 
Clue: It's the only city whose teams won the Super Bowl & the Stanley Cup in the same calendar year

Answer:
pittsburgh