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_12165135_1 (overall_pick__number VARCHAR, position VARCHAR)
### Question:
What is the pick number of the defensive back?
### Answer:
SELECT COUNT(overall_pick__number) FROM table_12165135_1 WHERE position = "Defensive Back"