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_2155350_2 (cab_size VARCHAR, category VARCHAR)
### Question:
Name the number of cab size for 4 medium tanker
### Answer:
SELECT COUNT(cab_size) FROM table_2155350_2 WHERE category = "4 Medium tanker"