input: What is the answer to this question? the northern expedition was a guomindang movement against whom in china?

output: other regional warlords

input: What is the answer to this question? who is the owner of oppo vivo and one plus?

output: BBK Electronics Corporation

input: What is the answer to this question? when does season 7 of once upon a time air?

output:
October 6, 2017