This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
[{'content': 'Adverse effect of phenytoin include all of the following except: \nSelect and explain. \nA. Lymphadenopathy, B. Ataxia, C. Hypercalcemia, D. Hirsutism', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref: KDT 6/e p404,405 phenytoin causes osteomalacia and results in hypocalcemia not hypercalcemia.', 'role': 'assistant'}]