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
An antiepileptic drug used in petitmal epilepsy is: 
Select and explain. 
A. Phenobarbitonse, B. Dilantoin sodium, C. Dilantoin sodium, D. Ethosuximide
D: Ethosuximide
Answer: D: Ethosuximide 
Explanation: None