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

Input: Consider Input: Of all the actors who played Doctor Who in the TV series of the same name, who appeared in the most episodes?

Output: doctor who


Input: Consider Input: 'Edward Lewis' and 'Vivian Ward' were the principal characters in which popular 1990 film?

Output: edward lewis


Input: Consider Input: Cilantro is the leaf of which herb?


Output: cilantro