This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
[{'content': 'Dye used for myelography is \nSelect and explain. \nA. Conray 320, B. Myodil, C. Dianosil, D. Iopanoicacid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Myelography uses a real-time form of x-ray called fluoroscopy and an injection of contrast material in subarachnoid space to evaluate the spinal cord, nerve roots and meninges. Iofendylate (Myodil) is a radiocontrast agent, typically used for performing myelography studies.It is paicularly useful for assessing the spine following surgery and for assessing disc abnormalities in patients who cannot undergo MRI.', 'role': 'assistant'}]