Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.

Who is the husband of Helen of Troy in Troilus and Cressida?
menelaus

Which female had a hit in 2011 Hold It Against Me?
britney spears

Which book by Gaston Leroux tells the story of a young composer named Eric?
the phantom of the opera