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

Q: Context : ISO 3166-2:IO is the entry for the British Indian Ocean Territory 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:IO?

A: International Organization for Standardization
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Q: Context : Karl-Wilhelm von Schlieben (30 October 1894 -- 18 June 1964) was a German officer in World War I and World War II. 
Question : Which war did Karl-Wilhelm von Schlieben participate in?

A: World War I
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Q: Context : Mainova AG was formed in 1998 through the merger of Stadtwerke Frankfurt am Main GmbH and Maingas AG. 
Question : What is Mainova's parent company?

A:
Stadtwerke Frankfurt
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