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

Context : Saint Ambrose barring Theodosius from Milan Cathedral is a 1619--1620 painting by Anthony van Dyck, now in the National Gallery in London. 
Question : What is the name of the place where Saint Ambrose barring Theodosius from Milan Cathedral can be found?
National Gallery

Context : Betty Fibichová (16 March 1846 -- 20 May 1901) was a Czechoslovak opera singer and the wife of composer Zdeněk Fibich. 
Question : What is Betty Fibichová's spouse's name?
Zdeněk Fibich

Context : ISO 3166-1 alpha-2 codes are two-letter country codes defined in ISO 3166-1, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), to represent countries, dependent territories, and special areas of geographical interest. 
Question : Who set the standards for ISO 3166-1 alpha-2?

International Organization for Standardization