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: Pharmacology
[{'content': "Phenytoin is associated with: \nSelect and explain. \nA. Folic acid deficiency, B. Alzhiemer's disease, C. Cushing's syndrome, D. Vitamin C deficiency", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]