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
Granulocytopenia, gingival hyperplasia and facial hir–sutism are all possible side effects of one of the following anticonvulsant drugs ? 
Select and explain. 
A. Phenytoin, B. Valproate, C. Carbamazepine, D. Phenobarbitone
A: Phenytoin
Answer: A: Phenytoin 
Explanation: None