Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Q: Context : Essent is part of RWE AG. Essent has 2.3 million customers for electricity and about 2.0 million for gas.
Answer : RWE

A: Which company is the parent company of Essent?
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Q: Context : Antonio Machin (Antonio Abad Lugo Machin; 11 February 1903, in Sagua la Grande, Cuba -- 4 August 1977, in Madrid) was a Cuban singer and musician.
Answer : 4 August 1977

A: The year Antonio Machin died was what?
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Q: Context : KOI-81 is an eclipsing binary star in the constellation of Cygnus.
Answer : Cygnus

A:
What is the name of the constellation which KOI-81 belongs?
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