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\*.

who's the lead singer of the doobie brothers
Tom Johnston

where does the white house get their christmas tree
various growers nationwide

when was the flamingo hotel in las vegas built

December 26, 1946