This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb vascular supply, Subject name: Anatomy
A 17-year-old boy with a stab wound received multiple injuries on the upper pa of the arm and required surgery. If the brachial aery were ligated at its origin, which of the following aeries would supply blood to the profunda brachii aery? 
Select and explain. 
A. Lateral thoracic, B. Subscapular, C. Posterior humeral circumflex, D. Superior ulnar collateral
C: Posterior humeral circumflex
Answer: C: Posterior humeral circumflex 
Explanation: The posterior humeral circumflex aery anastomoses with an ascending branch of the profunda brachii aery, whereas the lateral thoracic and subscapular aeries do not. The superior ulnar collateral and radial recurrent aeries arise inferior to the origin of the profunda brachii aery.