TASK DEFINITION: In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.
PROBLEM: The proof of having paid the road toll for swiss highways is called?

SOLUTION: Vignette

PROBLEM: Who coined the phrase war to end all wars?

SOLUTION: H. G. Wells

PROBLEM: Who canceled the production of a cradle will rock two days before opening night?

SOLUTION:
Works Progress Administration