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_name_59 (round INTEGER, overall VARCHAR, position VARCHAR)
### Question:
What is the lowest round for an offensive guard when the overall is smaller than 150?
### Answer:
SELECT MIN(round) FROM table_name_59 WHERE overall < 150 AND position = "offensive guard"