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]: Who sang must be talking to an angel?
[EX A]: Which duo sang must be talking to an angel? 
 Eurythmics

[EX Q]: What do brackets in an chemical equation mean?
[EX A]: What do square brackets in an chemical equation mean for molecules? 
 used around the chemical molecular formula

[EX Q]: Who appoints the chief justice of the supreme court?
[EX A]:
Who appoints the chief justice of the supreme court in the US? 
 president of the United States