What is the number of pole position with a round of 15?
CREATE TABLE table_1137707_2 (
    pole_position VARCHAR,
    round VARCHAR
)
SELECT COUNT(pole_position) FROM table_1137707_2 WHERE round = 15
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the number of pole position with a round of 15? ### Input: CREATE TABLE table_1137707_2 (
    pole_position VARCHAR,
    round VARCHAR
) ### Response: SELECT COUNT(pole_position) FROM table_1137707_2 WHERE round = 15