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

Positive Example 1 -
Input: Who was the first American President?
Output: president of the united states

Positive Example 2 -
Input: The Dutch duo of Ray Slijngaard and Anita Dels, who had 8 top ten hits in the 90s, were better known by what name?
Output: anita doth

Negative Example 1 -
Input: Anna Smashnova played which sport professionally until 2007?
Output: sport

Negative Example 2 -
Input: Rob Davis, Les Gray, Dave Mount and Ray Stiles are members of which pop group?
Output: david

Now complete the following example -
Input: What 2009 science fiction disaster film starring John Cusack, Chiwetel Ejiofor, Amanda Peet, Oliver Platt, Danny Glover, Thandie Newton, and Woody Harrelson references Mayanism and the Mesoamerican Long Count calendar, depicting a series of Doomsday scenarios that plunge the world into chaos?

Output: danny glover, woody harrelson, oliver platt, chiwetel ejiofor, john cusack