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 : An RGB color space is any additive color space based on the RGB color model. 
Answer : RGB color model
[A]: The RGB color space is based upon what?


[Q]: Context : Museum August Kestner, previously Kestner-Museum, is a museum in Hanover, Germany, founded in 1889. 
Answer : 1889
[A]: When did Museum August Kestner open?


[Q]: Context : China Airlines Flight 642 was a flight that crashed at Hong Kong International Airport on 22 August 1999. 
Answer : 22 August 1999
[A]:
The date of China Airlines Flight 642 was what?