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_15059783_1 (mountains_classification VARCHAR, winner VARCHAR, points_classification VARCHAR)
### Question:
If winner is alejandro Valverde and the points Classification is by Erik Zabel, who is the mountain classification?
### Answer:
SELECT mountains_classification FROM table_15059783_1 WHERE winner = "Alejandro Valverde" AND points_classification = "Erik Zabel"