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_15621965_18 (no VARCHAR, position VARCHAR, school_club_team VARCHAR)
### Question:
WHAT WAS THE JERSEY NUMBER OF THE ROSTER PLAYER FROM OKLAHOMA STATE WHO PLAYED GUARD?
### Answer:
SELECT no FROM table_15621965_18 WHERE position = "Guard" AND school_club_team = "Oklahoma State"