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

Answer: When was Hungen station opened?


Question: Context : ``Perfect Week'' is the 14th episode of the fifth season of the CBS situation comedy How I Met Your Mother and 102nd episode overall. 
Answer : How I Met Your Mother

Answer: Of what series is Perfect Week a part of?


Question: Context : 5 Cancri (5 Cnc) is a star in the constellation Cancer. 
Answer : Cancer

Answer:
What is the constellation that 5 Cancri is a part of?