Question: What is the question to: "In the context of nautical distances, the 3 mile (4.8 km) distance corresponds to how far an observer of average height (5'9" or 1.78 m) can see when standing at sea level."? The topic is League (unit).
Answer: "what is a league in the sea?"

Question: What is the question to: "The tri-tip is a cut of beef from the bottom sirloin primal cut ."? The topic is Tri-tip.
Answer: "what kind of cut is tri tip?"

Question: What is the question to: "Espresso has more caffeine per unit volume than most beverages, but the usual serving size is smaller—a typical 60 mL (2 US fluid ounce ) of espresso has 80 to 150 mg of caffeine, little less than the 95 to 200 mg of a standard 240 mL (8 US fluid ounces ) cup of drip-brewed coffee."? The topic is Espresso.
Answer:
"how much caffeine is in a shot of espresso?"