This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals in Radiology, Subject name: Radiology
Dye used for myelography 
Select and explain. 
A. Conray 320, B. Myodil, C. Dianosil, D. Iopaoic acid
B: Myodil
Answer: B: Myodil 
Explanation: contrast agents used for myelography are : Iohexol Iopamidol Metrizamide Myodil