Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Andy Schleck competes in what sport at an international level?
andy schleck

In which Indian city is Eden Gardens, the second largest test cricket ground in the world?
eden gardens

Which singer released the albums Aladdin Sane in 1973 and Let's Dance in 1983?

let's dance