Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.
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Question: For which series of films were the actors Kenneth Williams and Sid James best known?

Answer: carry on


Question: Which revolutionary leader was born Vladimir Ilyich Ulyanov?

Answer: vladimir lenin


Question: Which cover of an Elvis song gave the Pet Shop Boys a number one in 1987?

Answer:
always on my mind