This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
A 4-year-old boy fell on outstretched hand. X- ray is shown below. Which blood vessel is most commonly affected? 
Select and explain. 
A. Ulnar artery, B. Radial artery, C. Brachial artery, D. Cubital vein
C: Brachial artery
Answer: C: Brachial artery 
Explanation: Ans. C Brachial arteryRef: Essential Orthopedics, Maheshwari 5th ed. pg. 97The image shows displaced supracondylar fracture of humerus and the spike of proximal segment can easily traumatize the brachial artery.