user: Question: What is the League with a Year that is 1990/91?
Columns: ['Year', 'League', 'Reg. Season', 'Playoffs', 'Lost']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['1989/90', 'National Conference', '4th, Eastern', 'Did not qualify', 38.0]
SQL:

assistant: SELECT "League" FROM "Table" WHERE "Year" = '1990/91';