input question: Determine the topic of the question-answer pair. Question: "what are the characteristics of bryophytes?"; Answer: "Some bryophytes do have specialized tissues for the transport of water; however since these do not contain lignin , they are not considered to be true vascular tissue."? Topic:???
output answer: Bryophyte

Determine the topic of the question-answer pair. Question: "how fire extinguisher works?"; Answer: "Cartridge-operated extinguishers contain the expellant gas in a separate cartridge that is punctured prior to discharge, exposing the propellant to the extinguishing agent."? Topic:
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Answer: Fire extinguisher

Q: Determine the topic of the question-answer pair. Question: "what is an irregular heartbeat pvc?"; Answer: "A premature ventricular contraction (PVC), also known as a premature ventricular complex, ventricular premature contraction (or complex or complexes) (VPC), ventricular premature beat (VPB), or ventricular extrasystole (VES), is a relatively common event where the heartbeat is initiated by Purkinje fibres in the ventricles rather than by the sinoatrial node , the normal heartbeat initiator."? Topic:
A: Premature ventricular contraction

Question: Determine the topic of the question-answer pair. Question: "what part of the government governs the US post office??"; Answer: "The United States Postal Service (USPS), also known as the Post Office and U.S. Mail, is an independent agency of the United States federal government responsible for providing postal service in the United States."? Topic:
Answer: United States Postal Service

[Q]: Determine the topic of the question-answer pair. Question: "how is today special??"; Answer: "Today's Special is a Canadian children's television show produced by Clive VanderBurgh at TVOntario from 1981 to 1987."? Topic:
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[A]: Today's Special

Problem: Given the question: Determine the topic of the question-answer pair. Question: "who was on the 10 dollar bill?"; Answer: "The first U.S. Secretary of the Treasury (178995), Alexander Hamilton , is currently featured on the obverse of the bill, while the U.S. Treasury Building is featured on the reverse ."? Topic:
++++++++++++++++++++++++++++++++
The answer is:
United States ten-dollar bill