Generate a correct and concise answer for the question based on the words in the context.

[EX Q]: Context : The GCR Class 1 was a class of steam locomotives designed by John G. Robinson for the Great Central Railway, and introduced to service between December 1912 and 1913. 
Question : What was the year that GCR Class 1 entered service?
[EX A]: December 1912

[EX Q]: Context : Gabriel Kunda (born 20 October 1968) is a former Argentine male volleyball player. 
Question : What was the gender of Gabriel Kunda?
[EX A]: male

[EX Q]: Context : ISO 3166-2:GT is the entry for Guatemala 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. 
Question : Who set the standards for ISO 3166-2:GT?
[EX A]:
International Organization for Standardization