user: Question: What was the active period for the Pop genre?
Columns: ['Artist', 'Country of origin', 'Period active', 'Release-year of first charted record', 'Genre', 'Claimed sales']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Mariah Carey', 'United States', '1988–present', 1990.0, 'R&B / Pop / Rock', '200 million 175 million']
SQL:

assistant: SELECT "Period active" FROM "Table" WHERE "Genre" = 'Pop';