QUESTION: Generate a question with a factual answer?

ANS: What feature of bitumen use in photography made it impractical?

QUESTION: Generate a question with a factual answer?

ANS: When were the new plans of the airport revealed?

QUESTION: Generate a question with a factual answer?

ANS: What is the most recent era of Latin canon law?

QUESTION: Generate a question with a factual answer?

ANS:
What churches have been strongly engaged in the ecumenical movement?