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\*.
--------
Question: who was ancient china's main enemy that lived to the north

Answer: Sui Dynasty


Question: who won the voice in the united states in 2018

Answer: Brynn Cartelli


Question: who dropped the atomic bomb on hiroshima and nagasaki

Answer:
the United States