user: Question: Position of Fullback has what highest weight?
Columns: ['Player', 'Position', 'Games started', 'Hometown', 'Height', 'Weight', 'Class', 'Previous experience']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Charles B. Carter', 'Right guard', '10', 'Auburn, Maine', '6\' 0"', 231.0, "Law '05", 'Brown Varsity (2 years)']
SQL:

assistant: SELECT MAX("Weight") FROM "Table" WHERE "Position" = 'Fullback';