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\*.

[EX Q]: who's the lead singer of the doobie brothers
[EX A]: Tom Johnston

[EX Q]: who plays dr reid's mother on criminal minds
[EX A]: Jane Lynch

[EX Q]: factors that led to the decline of the great zimbabwe state
[EX A]:
political instability