[Q]: Answer this question: what is dmitri mendeleev 4?
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[A]: He formulated the Periodic Law, created his own version of the periodic table of elements , and used it to correct the properties of some already discovered elements and also to predict the properties of elements yet to be discovered!

input: Please answer the following: Answer this question: what is middle class in the us?
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output: Constituting roughly 15% to 20% of households is the upper or professional middle class consisting of highly educated, salaried professionals and managers.

Please answer this: Answer this question: what is social security card used for?
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Answer: Its primary purpose is to track individuals for Social Security purposes.

Problem: Answer this question: where is the country andorra located?

A: Andorra (; , ), officially the Principality of Andorra (), also called the Principality of the Valleys of Andorra, (), is a landlocked microstate in Southwestern Europe , located in the eastern Pyrenees mountains and bordered by Spain and France .

Problem: Given the question: Answer this question: what latitude is tropic of cancer?
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The answer is:
It currently (Year 2013) lies at 23 26 15.143 north of the Equator.

Problem: Answer this question: what are the characteristics of an ethnic group?

A:
Ethnicity or ethnic group is a socially defined category based on common culture or nationality .