Title: Middle Ages.
Question: Who wrote The Travels of Marco Polo?

Title: Hindu philosophy.
Question: How many categories of existence are there in Dvaitadvaita?

Title: Association football.
Question: How many yellow cards lead to a red card?

Title: Pacific War.
Question:
What is the river that the 40th, 3rd, and 6th Japanese divisions tried crossing to reach Changsha?