Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: 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?

### Accurate SQL ###

SELECT mountains_classification_klasyfikacja_górska FROM table_22917458_15 WHERE winner = "Alessandro Ballan"