user: Question: What is the class of the QB, Josh Riddell?
Columns: ['Name', 'Height', 'Weight', 'Class', 'Position', 'Hometown']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Keith Fitzhugh', '5\'11"', '206lbs.', 'Jr.', 'S', 'Hampton, Georgia']
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Position" = 'QB' AND "Name" = 'Josh Riddell';