Which one of the following arteries pierces the oblique popliteal ligament of the knee joint?

OBLIQUE POPLITEAL LIGAMENT Expansion from the tendon of semimembranosus. Runs upwards and laterally, blends with the posterior surface of the capsule, and is attached to the intercondylar line and lateral condyle of femur. Related to politeal artery. Structures piercing the ligament Middle Genicular vessels. Posterior division of obturator nerve