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.

Ex Input:
Context : An RGB color space is any additive color space based on the RGB color model.
Answer : RGB color model

Ex Output:
The RGB color space is based upon what?

Ex Input:
Context : Transdev Auckland, formerly Veolia Transport Auckland, Ltd., and before that Connex Auckland, Ltd., is a Transdev Australasia company.
Answer : Transdev Australasia

Ex Output:
Which company is the parent company of Transdev Auckland?

Ex Input:
Context : Offenbach Ost station was opened on 15 November 1873 on the Frankfurt-Hanau line.
Answer : 15 November 1873

Ex Output:
When was Offenbach Ost station opened officially?