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_name_12 (opponent VARCHAR, method VARCHAR, record VARCHAR)
### Question:
What opponent used the Ko method, and a 6-0 record?
### Answer:
SELECT opponent FROM table_name_12 WHERE method = "ko" AND record = "6-0"