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.

When did o canada become canada's national anthem?
When was o canada first used as canada's national anthem?|When did "O Canada" become Canada's de facto national anthem? 
 1939

When was the song we are the world recorded?
What was the first night of recording for the song We are the World? 
 January 21, 1985

Who sang the theme song to petticoat junction?

Who sang the theme song to petticoat junction used on the original show? 
 Curt Massey