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: who played barney fife on the andy griffith show

SOLUTION: Jesse Donald Knotts

PROBLEM: which article of the constitution outlines the legislative branch

SOLUTION: Article One

PROBLEM: what is the least common blood type in the usa

SOLUTION:
AB−