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': 'Nerve commonly damaged in fracture shaft humerus is - \nSelect and explain. \nA. Axillary nerve, B. Radial nerve, C. Ulnar nerve, D. Median nerve', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Radial nerve Complications Fracture shaft humerus* Nerve injury: The radial nerve is commonly injured in a fracture of the humeral shaft. The injury to the nerve is generally a neurapraxia only. A special type of humerus fracture, where there is a spiral fracture at the junction of the middle and distal third, is commonly known to be associated with a radial nerve palsy. This is called Holstein Lewis fracture.* Delayed and non-union: Fractures of the shaft of the humerus, especially transverse fracture of the midshaft, often go into delayed or non-union. The causes of non-union are: inadequate immobilization or distraction at the fracture site because of the gravity.", 'role': 'assistant'}]