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_19 (challenge_winner VARCHAR, challenge_loser VARCHAR)
### Question:
Which winner has a Challenge Loser of gisel?
### Answer:
SELECT challenge_winner FROM table_name_19 WHERE challenge_loser = "gisel"