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

What actress, born in Muscat, Oman, began acting on Australian television on Paradise Beach and Home and Away and is known for her roles in Wedding Crashers (2005), Hot Rod (2007), Definitely, Maybe (2008) and Confessions of a Shopaholic (2009)?
definitely, maybe

What country has an official residence called Blair House, kept for guests of the leader of the country?
blair

Billie Joe Armstrong, Mike Dirnt and Tr Cool are collectively known as which band?

billie joe armstrong