TASK DEFINITION: In this task, you are given a statement spoken by a politician in natural language. Your task is to generate the subject of the discussion for the given statement. The subject generated is not necessarily a part of the given input. Your answer should contain one or more words.
PROBLEM: Keystone means unlocking the Canadian tar sands.

SOLUTION: energy

PROBLEM: On his support for Donald Trump.

SOLUTION: elections

PROBLEM: Says Nikita Khrushchev brought an extra shoe to a United Nations session in 1960, which he banged on the desk in protest.

SOLUTION:
history