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
Gingival enlargement is a side effect of 
Select and explain. 
A. Phenytoin, B. Calcium channel blockers, C. Acute myelocytic leukemia, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None