Generate a question with a factual answer.
Generated: What caused the decrease in commerce and production in the 14th century?

Generate a question with a factual answer.
Generated: What takes part on the east side of the main park every Sunday?

Generate a question with a factual answer.
Generated: What is the name of a notable green office building in New York?

Generate a question with a factual answer.
Generated: What type of pictoral aid is often used to show this?