input: Please answer the following: Answer this question: what is the title of Hobbes main work?
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output: His 1651 book Leviathan established the foundation for most of Western political philosophy from the perspective of social contract theory.

input: Please answer the following: Answer this question: what day is the federal holiday for Martin Luther King Jr.?
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output: It is observed on the third Monday of January each year, which is around the time of King's birthday, January 15.

input: Please answer the following: Answer this question: when was the great fire in chicago?
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output: The Great Chicago Fire was a conflagration that burned from Sunday, October 8, to early Tuesday, October 10, 1871, killing hundreds and destroying about in Chicago , Illinois .

input: Please answer the following: Answer this question: what is the @ sign called??
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output:
The at sign @ is also commonly called the at symbol, ampersat, apetail or commercial at in Englishand less commonly a wide range of other terms.