input question: Determine the topic of the passage. "The North American Free Trade Agreement (NAFTA) is an agreement signed by Canada , Mexico , and the United States , creating a trilateral trade bloc in North America ." Topic:???
output answer: North American Free Trade Agreement

Determine the topic of the passage. "Located at the mouth of the Yodo River on Osaka Bay , Osaka is Japan's third largest city by population after Tokyo (special wards) and Yokohama ." Topic:
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Answer: Osaka

Q: Determine the topic of the passage. "A mathematical constant is a special number , usually a real number , that is "significantly interesting in some way"." Topic:
A: Mathematical constant

Question: Determine the topic of the passage. "Wendy Williams Hunter (born Wendy Joan Williams; July 18, 1964) is an American media personality , actress and author." Topic:
Answer: Wendy Williams

[Q]: Determine the topic of the passage. "The at sign @ is also commonly called the at symbol, ampersat, apetail or commercial at in English—and less commonly a wide range of other terms." Topic:
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[A]: At sign

Problem: Given the question: Determine the topic of the passage. "In the maintenance of file systems , defragmentation is a process that reduces the amount of fragmentation ." Topic:
++++++++++++++++++++++++++++++++
The answer is:

Defragmentation