Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.

Ex Input:
Martha Dandridge was the 1st lady of which American President?

Ex Output:
george washington

Ex Input:
New York housewife Jean Nidetch (1923-2015) founded which global organization, sold to Heinz in 1978 for $71m?

Ex Output:
weight watchers

Ex Input:
What is the name for the negative pressure generator invented by Robert Henderson and used extensively by Phillip Drinker and Louis Agassiz Shaw?

Ex Output:
iron lung