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 : Karen Cho is an Asian-Canadian documentary filmmaker in Montreal, Quebec, Canada. 
Answer : Montreal
[A]: What city is Karen Cho from?


[Q]: Context : Catch the Lightning is a novel by Catherine Asaro in the Saga of the Skolian Empire, also known as Tales of the Ruby Dynasty. 
Answer : Saga of the Skolian Empire
[A]: To which series does Catch the Lightning belong?


[Q]: Context : The Caledonian Railway 670 Class was a class of 0-4-2 steam locomotives designed by George Brittain for the Caledonian Railway (CR) and introduced in 1878. 
Answer : 1878
[A]:
Which was the official year for the approval of Caledonian Railway 670 Class?