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\*.

[Q]: why do you put fork marks on peanut butter cookies
[A]: convenience


[Q]: when did flint michigan's water become contaminated
[A]: 2014


[Q]: when did they stop making tin type photos
[A]:
early 20th century