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.

Input: Consider Input: Context : Montasio is a mountain cheese made from cow's milk produced in northeastern Italy in the regions of Friuli-Venezia Giulia and Veneto.
Answer : cow's milk

Output: What material was used for Montasio?

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

Output: When was Hungen station opened?

Input: Consider Input: Context : Caterina Sforza (1463 -- 28 May 1509), was an Italian noblewoman and Countess of Forli and Lady of Imola firstly with her husband Girolamo Riario, and after his death as a regent of her son Ottaviano.
Answer : Girolamo Riario
Output: What is Caterina Sforza's spouse's name?