TASK DEFINITION: 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\*.
PROBLEM: what is the percentage of finding a four leaf clover

SOLUTION: 5,000 to 1

PROBLEM: where does the rio grande start and finish

SOLUTION: Gulf of Mexico

PROBLEM: who sang the national anthem super bowl last year

SOLUTION:
Luke Bryan