user: Question: What is the only type of university that was founded in 1873?
Columns: ['School', 'Location(s)', 'Control', 'Type', 'Enrollment', 'Founded']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Harris-Stowe State University', 'St. Louis', 'Historically black * Public university', 'Baccalaureate College', 1854.0, 1857.0]
SQL:

assistant: SELECT "Control" FROM "Table" WHERE "Founded" = 1873.0;