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
Dye used for myelography is 
Select and explain. 
A. Conray 320, B. Myodil, C. Dianosil, D. Iopanoicacid
B: Myodil
Answer: B: Myodil 
Explanation: 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.