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': 'Dye for myelography is injected in which space : \nSelect and explain. \nA. Subdural, B. Epidural, C. Subarachnoid, D. Extradural', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Myelography is the radiographic investigation of the spinal canal for the diagnosis of space occupying an obstructive lesion. It requires the contrast agent to be injected\xa0 into\xa0subarachnoid space.\nMRI has replaced myelography, these days.', 'role': 'assistant'}]