instruction:
In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.
question:
when were air brakes first used on trucks
answer:
the early 20th century


question:
when is the roast of justin bieber on comedy central
answer:
March 30, 2015


question:
when does lexi die in grey's anatomy
answer:

the eighth-season finale