Which three pelvic veins drain into the GSV?

The correct answer identifies the three pelvic veins that specifically drain into the great saphenous vein (GSV). The superficial inferior epigastric vein, superficial external pudendal vein, and superficial circumflex iliac vein are all considered to be superficial veins located in the pelvic region. These veins are directly involved in draining blood from the superficial tissues of the lower abdomen and groin area and subsequently empty into the GSV, which is a major vein of the lower extremity.

The superficial inferior epigastric vein drains the superficial abdominal wall, while the superficial external pudendal vein drains the skin and superficial structures of the external genitalia. The superficial circumflex iliac vein drains the lateral aspect of the body wall. By collecting blood from these specific areas, they contribute to the flow into the GSV, which plays a crucial role in venous blood return from the lower limbs to the heart.

The other options include veins that either do not typically drain into the GSV or involve deeper venous systems that are not considered part of the superficial venous drainage directly connected to the GSV. This distinction is important in understanding the venous anatomy pertinent to phlebology and how superficial and deep veins interact within the circulatory system.