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.

Under President Bush in eight years, we added $4.9 trillion to the debt. Under President Obama, weve added $5.3 trillion to the debt in the 3.5 years hes been in office.
debt

Says Texas wildfires are linked to climate change.
climate-change

In one Colorado hospital, 50 percent of newborns tested had marijuana in their system.

marijuana