user: Question: What is the control type which was founded in 1991?
Columns: ['School', 'Location(s)', 'Control', 'Type', 'Accreditation', 'Founded', 'Enrollment']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Baptist Theological Seminary at Richmond', 'Richmond', 'Private', 'Special focus', 'none', '1991', 'Unknown']
SQL:

assistant: SELECT "Control" FROM "Table" WHERE "Founded" = '1991';