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

Which BBC current affairs programme, the longest-running in the world, is 60 years old this year ?
bbc

Which was the title of the 7th and final book in the Chronicles of Narnia by C.S. Lewis?
the chronicles of narnia

Competitors from which country won the most medals at the World Artistic Gymnastics Championships held in Rotterdam, Netherlands from 16 to 24 October 2010?

artistic gymnastics