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_23982399_12 (challenger VARCHAR, winner VARCHAR)
### Question:
Who was the challenger when winner was kimio nonaga?
### Answer:
SELECT challenger FROM table_23982399_12 WHERE winner = "Kimio Nonaga"