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: when did the iphone 5 first come out

SOLUTION: September 21, 2012

PROBLEM: when did the japanese surrender in the philippines

SOLUTION: 5 July 1945

PROBLEM: where does the heart's electrical stimulus originate from

SOLUTION:
sinoatrial node