Determine the topic of the question-answer pair. Question: "what measurement is a furlong?"; Answer: "A furlong is a measure of distance in imperial units and U.S. customary units equal to one-eighth of a mile , equivalent to 220 yards , 660 feet , 40 rods , or 10 chains ."? Topic:
----
Answer: Furlong

Determine the topic of the question-answer pair. Question: "when did pearl harbor get bombed?"; Answer: "The attack on Pearl Harbor (called Hawaii Operation or Operation AI by the Japanese Imperial General Headquarters (Operation Z in planning) and the Battle of Pearl Harbor) was a surprise military strike conducted by the Imperial Japanese Navy against the United States naval base at Pearl Harbor , Hawaii, on the morning of December 7, 1941 (December 8 in Japan)."? Topic:
----
Answer: Attack on Pearl Harbor

Determine the topic of the question-answer pair. Question: "who wrote what's my name rihanna?"; Answer: "The R&B song was produced by the Norwegian production duo StarGate , and was written by the duo along with Ester Dean , Traci Hale , and Drake ."? Topic:
----
Answer:
What's My Name? (Rihanna song)