This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, 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: Ans. is 'd' i.e., None of the above", 'role': 'assistant'}]