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': "Most common cause of neurological deficit in upper limb is - \nSelect and explain. \nA. Polio, B. Erb's palsy, C. C1-C2 dislocation, D. Fracture dislocation of cervical spine", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]