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\*.

where does the rio grande start and finish
Gulf of Mexico

when do the afl semi finals start 2018
Friday, September 14

when did the us last host the olympics

2002 Winter Olympics