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.

What do brackets in an chemical equation mean?
What do square brackets in an chemical equation mean for molecules? 
 used around the chemical molecular formula

What is the minimum wage in the united states today?
What is the federal minimum wage in the united states in 2019? 
 $7.25 per hour

Who sang the national anthem at the superbowl?

Who sang the national anthem at the superbowl in 2017? 
 Luke Bryan