This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Injury occurs at C7 root, in what pa of arm, sensation will be lost \nSelect and explain. \nA. Upper medial, B. Lower medial, C. Posterior, D. None of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: BD CHAURASIA S HUMAN ANATOMY SIXTH edition Vol 1 Arm is not supplied by cranial nerves It is mainly supplied by ulnar and median nerve So an injury to root of C 7 is most unlikely to cause loss of sensation of arm', 'role': 'assistant'}]