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
[{'content': 'Which of follow is a non ionic contrast agent ? \nSelect and explain. \nA. Ioxoglate, B. Iohexol, C. Iothalamate, D. Amidotrizoate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ioxoglate is ionic dimer contrast agent Iohexol is non ionic monomer contrast agent Iothalamate and Amidotrizoate are ionic monomer contrast agents Also remember : Iodixanol and iotrolan are non ionic dimer contrast agents', 'role': 'assistant'}]