TASK DEFINITION: Generate a correct and concise answer for the question based on the words in the context.
PROBLEM: Context : ISO 3166-2:ZA is the entry for South Africa 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:ZA?

SOLUTION: International Organization for Standardization

PROBLEM: Context : HD 19275 is a 5th magnitude star in the constellation Cassiopeia, approximately 162 light years away from Earth. 
Question : In which constellation is HD 19275?

SOLUTION: Cassiopeia

PROBLEM: Context : British Rail 18100 was a prototype main line gas turbine-electric locomotive built for British Railways in 1951 by Metropolitan-Vickers, Manchester. 
Question : What year was the service entry date for British Rail 18100?

SOLUTION:
1951