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_22917458_15 (mountains_classification_klasyfikacja_górska VARCHAR, winner VARCHAR)
### Question:
Who was the mountain classification winner in the stage won by Alessandro Ballan?
### Answer:
SELECT mountains_classification_klasyfikacja_górska FROM table_22917458_15 WHERE winner = "Alessandro Ballan"