user: Question: when Sanchez ( ESP ) W 5-0 were the bout 6, which were the class?
Columns: ['Athlete', 'Class', 'Event', 'Bout 1', 'Bout 2', 'Bout 3', 'Bout 4', 'Bout 5', 'Bout 6', 'Rank', '1/8 Finals', 'Quarterfinals', 'Semifinals']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Abdullah Alhaddad', 'Cat. A', 'Foil', 'Pender ( POL ) L 3-5', 'Maillard ( FRA ) L 1-5', 'Mato ( HUN ) L 1-5', 'Pellegrini ( ITA ) L 4-5', 'Andreev ( RUS ) W 5-2', 'N/A', '5 Q', 'Pender ( POL ) L 6-15', 'Did not advance', 'Did not advance']
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Bout 6" = 'Sanchez ( ESP ) W 5-0';