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.

[EX Q]: The proof of having paid the road toll for swiss highways is called?
[EX A]: Vignette

[EX Q]: What body of water do the tigris and euphrates rivers empty into?
[EX A]: Shatt al-Arab

[EX Q]: Who does the voice of tina on bob's burgers?
[EX A]:
Dan Mintz