In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to provide one question which clarifies the input question and it has one unique answer, and also provide an answer to the generated question. Generated question and answer should be separated with a new line.

[EX Q]: Which type of economy most often practices polygyny?
[EX A]: Which type of farming economy most often practices polygyny? 
 extensive shifting horticulture

[EX Q]: Where was the lord of the rings filmed?
[EX A]: Which country was where the lord of the rings exclusively filmed? 
 New Zealand

[EX Q]: When did army air corps become air force?
[EX A]:
When did US army air corps become air force? 
 20 June 1941