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: Arshile Gorky, Willem de Kooning, Franz Kline, Mark Rothko, Philip Guston, Hans Hofmann, Clyfford Still, Barnett Newman, Ad Reinhardt, Richard Pousette-Dart, Robert Motherwell, Peter Voulkos & Jackson Pollock painted in what style?

Output: peter voulkos, franz kline, philip guston, mark rothko, arshile gorky, richard pousette-dart, jackson pollock, robert motherwell, barnett newman, clyfford still, hans hofmann, ad reinhardt