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: Medicine
[{'content': "Horner's syndrome may be caused by all of the following, Except \nSelect and explain. \nA. Carotid Aery Aneurysm, B. Medial Medullary Syndrome, C. latrogenic, D. Multiple Sclerosis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is D (Mycophenolate): Mycophenolate is lymphocyte specific oral immunosuppressant that is presently being studied for its role in Multiple Sclerosis. Presently Mycophenolate is not U.S. FDA approved for use in Multiple Sclerosis and hence this drug cannot be recommended for the treatment of M.S. at present.', 'role': 'assistant'}]