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

Context : Antonio Machín (Antonio Abad Lugo Machín; 11 February 1903, in Sagua la Grande, Cuba -- 4 August 1977, in Madrid) was a Cuban singer and musician. 
Question : The year Antonio Machín died was what?
4 August 1977

Context : Ahmet Gülhan (born on 28 March 1978 in Ankara) is a male freestyle wrestler from Turkey. 
Question : What is the gender Ahmet Gülhan is associated with?
male

Context : ISO 3166-2:GR is the entry for Greece 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:GR?

International Organization for Standardization