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 : ISO 3166-2:CU is the entry for Cuba in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1. 
Answer : International Organization for Standardization

Answer: Who set the standards for ISO 3166-2:CU?


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 : Portrait of Sara Wolphaerts van Diemen is a painting by the Dutch Golden Age painter Frans Hals, painted around 1630-1633 and now in the Rijksmuseum. 
Answer : Rijksmuseum

Answer:
What is the name of the place where Sara Wolphaerts van Diemen can be found?