Question: What is the question to: "First used to denote national affiliations, the term began to be used to relate to physical traits in the 17th century."? The topic is Race (human classification).
Answer: "when did classification of races begin?"

Question: What is the question to: "Root beer is a carbonated , sweetened beverage , originally made using the root of a sassafras plant (or the bark of a sassafras tree) as the primary flavor."? The topic is Root beer.
Answer: "how is root beer made??"

Question: What is the question to: "It's worth a thousand words." appears in a 1911 newspaper article quoting newspaper editor Arthur Brisbane discussing journalism and publicity."? The topic is A picture is worth a thousand words.
Answer:
"who said "A picture is worth a thousand words"??"