user: Question: What was the gtu winning team when the gto winning team was #48 Greenwood Racing?
Columns: ['Rnd', 'Circuit', 'GTO Winning Team', 'GTU Winning Team', 'TO Winning Team', 'TU Winning Team', 'Results']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Texas', '#42 Corvette', '#59 Peter Gregg', '#48 Mustang', '#16 2002', 'Results']
SQL:

assistant: SELECT "GTU Winning Team" FROM "Table" WHERE "GTO Winning Team" = '#48 Greenwood Racing';