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

Input: Consider Input: On which holiday island are the peaks of 'Ruivo' and 'Arieiro', and the airport of 'Santa Cruz'?

Output: pico do arieiro


Input: Consider Input: What is the title of the four-episode special of 'Doctor Who', made for the Red Nose Day telethon in the UK, broadcast in March 1999?

Output: doctor who


Input: Consider Input: Which model was married to singer Billy Joel for 9 years, from 1985?


Output: billy joel