This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injuries Around Arm & Elbow, Subject name: Orthopaedics
[{'content': 'Fracture shaft of humerus is associated with which nerve damage? \nSelect and explain. \nA. Median, B. Ulnar, C. Radial, D. Musculocutaneous', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. c (Radial). (Ref. Orthopedics Maheshwari, 2nd/77; Das surgery, 330;Last Anatomy8th/70, 83,94)# Radial nerve is in contact with the periosteum of the humerus, at the lower end of the radial groove.# Radial nerve may be injured at time of injury or later when involved in callus formation (tardy palsy).# In closed fracture the nerve injury is usually neuropraxia & recovery is the rule.', 'role': 'assistant'}]