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 played the character Gene Hunt in the UK TV series 'Life on Mars' and 'Ashes to Ashes'?

Answer: life on mars


Question: Carpo and Elara are moons of which planet?

Answer: elara


Question: What is the real name of Baby Spice of the Spice Girls, whose 2007 single All I Need to Know was the lowest-charting single of her solo career?

Answer:
all i need to know