Which two veins unite to form the innominate/brachiocephalic vein?

The innominate vein, also known as the brachiocephalic vein, is formed by the union of the internal jugular vein and the subclavian vein on each side of the body. The internal jugular vein is responsible for draining blood from the head and neck region, while the subclavian vein carries blood from the upper extremity. When these two veins merge, they form the innominate vein, which then plays a key role in channeling blood back towards the heart, specifically into the superior vena cava.

Understanding this anatomical relationship is crucial, as the formation of the innominate vein is essential for effective blood circulation from the upper body. Other options presented do not represent veins that combine to form the innominate vein, thus reinforcing why the selected answer accurately reflects the correct anatomical pairing.