Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
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Question: Who wrote and recorded the original version of the song Blue Suede Shoes which was a hit single for Elvis Presley in 1955?

Answer: blue suede shoes

Question: What was the name of the Prime Minister of Egypt who was assassinated in 1910?

Answer: egypt

Question: In terms of population, Cordoba is the second largest city of which country?

Answer:
cordoba