instruction:
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.
question:
Context : Marijke Schaar (born 12 November 1944), also known under her maiden name Marijke Jansen, is a former Dutch female tennis player who was active during the 1960s and 70s. 
Answer : female
answer:
What sex is Marijke Schaar?


question:
Context : ``Restful Place'' focuses on a curved limestone bench and above it is an arched bronze and glass canopy. 
Answer : limestone
answer:
What is the surface of Restful Place made of?


question:
Context : ISO 3166-2:NF is the entry for Norfolk Island 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:NF?