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: Radiology
[{'content': 'Most common complication of myelography is \nSelect and explain. \nA. Allergic reaction, B. Headache, C. Focal neurological deficit, D. A rachanoi di tis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Headache', 'role': 'assistant'}]