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

Ex Input:
Who served in the Crimean War (1854 - 56), was responsible for suppressing the Taiping rebellion in China in 1860, was governor of the Sudan 1877 - 79, and died there?

Ex Output:
taiping rebellion


Ex Input:
Which horse won the 2008 Grand National?

Ex Output:
2008 grand national


Ex Input:
With eight goals which Barcelona player was the leading scorer in the 2009-10 Champions League?

Ex Output:

barcelona