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

In 2013 Yahoo purchased which pictures and video microblogging website business that was founded in 2007 in New York City by David Karp?
yahoo!

Who had a hit album in 2010 with Can't Be Tamed?
can't be tamed

Which 1st World War battle of 1916 saw 60,000 British casualties on the first day The battle lasted from July to November, resulting in a British advance of 12 kilometres.?

world war i