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: Orthopaedics
[{'content': 'Nerve commonly involved in fracture distal shaft of the Humerus - \nSelect and explain. \nA. Radial nerve, B. Medial, C. Ulnar, D. Circumflex brachial nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Radial nerve is the most commonly injured nerve in fracture shaft humerus. It is particularly common in oblique fractures at the junction of middle and distal third bone ( Hoistein-lewis fracture)', 'role': 'assistant'}]