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.

Q: Context : ISO 3166-2:MW is the entry for Malawi 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

A: Who set the standards for ISO 3166-2:MW?
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Q: Context : Charles R. Weatherhogg (1872 - 1937) was an American architect from Fort Wayne, Indiana. 
Answer : Fort Wayne

A: What city is Charles R. Weatherhogg associated with?
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Q: Context : The Nelson Mandela 90th Birthday Tribute was held in Hyde Park, London on 27 June 2008 to commemorate Nelson Mandela's ninetieth birthday (18 July). 
Answer : 27 June 2008

A:
The date of Nelson Mandela 90th Birthday Tribute was what?
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