This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Pharmacology
[{'content': 'Which antiepileptic drug leads to gingival hyperplasia: \nSelect and explain. \nA. Phenytoin, B. Carbamazepine, C. Valproate, D. Lamotrigine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. PhenytoinPhenytoin causes gingival hyperplasia, hirsutism, megaloblastic anemia, osteomalacia. Carbamazepine causes agranulocytosis, valproate is hepatotoxic and also causes spina bifida. Lamotrigine is known to cause Steven Johnson syndrome.', 'role': 'assistant'}]