QUESTION: Generate a question with a factual answer?

ANS: What year was stereo sound patented?

QUESTION: Generate a question with a factual answer?

ANS: What did Japan call the occupied group of Asian nations?

QUESTION: Generate a question with a factual answer?

ANS: In what era did the Protestant Reformation occur?

QUESTION: Generate a question with a factual answer?

ANS:
When did Hou Xian and Zhi Guang return to Nanjing?