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

Ex Input:
Who released the albums Sentimental Journey, Goodnight Vienna, Bad Boy, Old Wave and Vertical Man between 1970 and 1999?

Ex Output:
vertical man


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

Ex Output:
pico do arieiro


Ex Input:
Daniel Casey played the role of Detective Sergeant Troy in which TV series?

Ex Output:

daniel casey