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.

Context : Gelnhausen railway (Hungen--Gießen) was opened on 29 December 1869 and Hungen station went into operation. 
Answer : 29 December 1869
When was Hungen station opened?

Context : Torre Picasso (Picasso Tower) is a skyscraper in Madrid, Spain designed by Minoru Yamasaki. 
Answer : Minoru Yamasaki
What architect designed Torre Picasso?

Context : Rehana Sultan, (born 19 November 1950) is an Indian film actress best known for her debut role in the acclaimed 1970 film Dastak which won her the National Film Award for Best Actress. 
Answer : National Film Award for Best Actress

Which award was bestowed upon Rehana Sultan?