Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
when Sanchez ( esp ) w 5-0 were the bout 6, which were the class?

### Inputs:
table_name: table, columns: ['Athlete', 'Class', 'Event', 'Bout 1', 'Bout 2', 'Bout 3', 'Bout 4', 'Bout 5', 'Bout 6', 'Rank', '1/8 Finals', 'Quarterfinals', 'Semifinals']

### Response:
SELECT Class FROM table WHERE Bout 6 = Sanchez ( ESP ) W 5-0