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
Phenytoin is most widely used for 
Select and explain. 
A. Grand mal epilepsy, B. Status epilepsy, C. Trigeminal neuralgia, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None