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