This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pharmacology
[{'content': 'Megaloblastic anemia may be caused by all of the following except \nSelect and explain. \nA. Dilantin toxicity, B. Vitamin B12 deficiency, C. Folic acid deficiency, D. Long term aspirin intake', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Dilantin is phneytion. It reults in folic acid deficiency that can result in Megaloblastic anemia', 'role': 'assistant'}]