Problem: Given the question: Determine the topic of the question-answer pair. Question: "who sang the nights the lights went out?"; Answer: ""The Night the Lights Went Out in Georgia" is a Southern Gothic song written by songwriter Bobby Russell and performed in 1972 by his then-wife Vicki Lawrence ."? Topic:
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The answer is:
The Night the Lights Went Out in Georgia

input question: Determine the topic of the question-answer pair. Question: "What is and where is hydraulic fluid found and used for?"; Answer: "Common hydraulic fluids are based on mineral oil or water."? Topic:???
output answer: Hydraulic fluid

Determine the topic of the question-answer pair. Question: "what is the capacity of the cowboy stadium?"; Answer: "The maximum capacity of the stadium, including standing room, is 105,000."? Topic:
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Answer: Cowboys Stadium

Q: Determine the topic of the question-answer pair. Question: "when did playstation 3 first launch?"; Answer: "The launch of the PlayStation 3 into the Japanese market on 10 November 2006 marked the second major seventh generation entertainment system to be released."? Topic:
A: PlayStation 3 launch

Question: Determine the topic of the question-answer pair. Question: "who did richard nixon refer to as the silent majority?"; Answer: "In this usage it referred to those Americans who did not join in the large demonstrations against the Vietnam War at the time, who did not join in the counterculture , and who did not participate in public discourse."? Topic:
Answer: Silent majority

Please answer this: Determine the topic of the question-answer pair. Question: "when does a demand curve shift??"; Answer: "In economics , the demand curve is the graph depicting the relationship between the price of a certain commodity and the amount of it that consumers are willing and able to purchase at that given price."? Topic:
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Answer:
Demand curve