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 toxicity- \nSelect and explain. \nA. Gum hyperophy, B. Acne rosacea, C. Exacerbation of acne vulgaris, D. Loss of hair', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Gum hyperophy", 'role': 'assistant'}]