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

Input: Consider Input: What is the only nation state of the Commonwealth of Nations on the mainland of South America?

Output: commonwealth of nations


Input: Consider Input: Which English king was married to Eleanor of Castile?

Output: eleanor of castile


Input: Consider Input: Olympic gold medallists Paavo Nurmi, Ville Ritola, Clas Thunberg and Lasse Virn represented which country?


Output: clas thunberg