The correct answer is: basilic

There are two large cutaneous veins running up the forearm. Both veins take origin from the dorsal venous arch of the hand and run up the lateral and medial sides of the forearm. On the medial side (near the 5th digit) there is the basilic vein. On the lateral side, there is the cephalic vein. Since the infection is on the medial side, the correct answer is the basilic vein. (Remember that the hands are supinated in the anatomical position--this comes in handy when you are thinking about the medial and lateral sides of the forearm.)

The brachial vein runs with the brachial artery-- it is a deep vein that ends at the level of the elbow. The ulnar vein runs with the ulnar artery, draining the ulnar side of the forearm. Neither of these veins are located in superficial tissue. The median cubital vein is a cutaneous vein, but it is short and only found in the median cubital fossa. It provides a connection between the cephalic vein and basilic vein.