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_15366849_1 (c_ VARCHAR, metropolitan_borough_ VARCHAR, station VARCHAR)
### Question:
How many metropolitan boroughs have dorridge as a station?
### Answer:
SELECT COUNT(metropolitan_borough_)[c_] FROM table_15366849_1 WHERE station = "Dorridge"