This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Adverse Adverse effects 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: Phenytoin interferes with calcium metabolism by desensitizing target tissue to vit. D, this causes hypocalcemia (not hypercalcemia). At therapeutic level (10-20microg/ml) - Gum hyperophy, hirsutism, hypersensitivity (rashes, lymphadenopathy, DLE, neutropenia), hyperglycemia due to inhibition of insulin release, megaloblastic anemia, pseudolymphoma, hypocalcemia, Vitamin D deficiency and osteomalacia, and teratogenicity (fetal hydantoin syndrome). At toxic level (dose-related) cerebellar syndrome (ataxia, veigo), falling BP, arrhythmias, drowsiness, mental confusion, Gl symptoms (epigastric pain, nausea, vomiting) and local vascular injury by iv injection. REF : katzung pharmacology : 14th ed', 'role': 'assistant'}]