input question: Determine the topic of the question-answer pair. Question: "what county is tacoma washington in?";  Answer: "Tacoma (, ) is a mid-sized urban port city and the county seat of Pierce County, Washington , United States."? Topic:???
output answer: Tacoma, Washington

input question: Determine the topic of the question-answer pair. Question: "what is the title of Hobbes main work?";  Answer: "His 1651 book Leviathan established the foundation for most of Western political philosophy from the perspective of social contract theory."? Topic:???
output answer: Thomas Hobbes

input question: Determine the topic of the question-answer pair. Question: "how does a dredge work??";  Answer: "Developing this idea further, a motorized crane equipped with a drag bucket or clamshell (grabber) that is used to scoop material from the bottom of a body of water is also a dredger."? Topic:???
output answer: Dredging

input question: Determine the topic of the question-answer pair. Question: "what is the source of geothermal energy?";  Answer: "The Geothermal energy of the Earth's crust originates from the original formation of the planet (20%) and from radioactive decay of minerals (80%)."? Topic:???
output answer:
Geothermal energy