Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_19398910_4 (class VARCHAR, bout_6 VARCHAR)
### Question:
when Sanchez ( esp ) w 5-0 were the bout 6, which were the class?
### Answer:
SELECT class FROM table_19398910_4 WHERE bout_6 = "Sanchez ( ESP ) W 5-0"