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: Dental
[{'content': 'Gingival enlargement is a side effect of \nSelect and explain. \nA. Phenytoin, B. Calcium channel blockers, C. Acute myelocytic leukemia, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]