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
A patient with recent–onset primary generalized epilepsy develops drug reaction and skin rash due to phenytoin sodium. The most appropriate course of action is : 
Select and explain. 
A. Shift to clonazepam, B. Restart phenytoin sodium after 2 weeks, C. Shift to sodium valproate, D. Shift to ethosuximide
C: Shift to sodium valproate
Answer: C: Shift to sodium valproate 
Explanation: None