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 65 years old male presented to a hospital with focal seizures. His renal function was normal. Which of the following is the drug of choice for this patient ? 
Select and explain. 
A. Valproate, B. Pregabalin, C. Levetiracetam, D. Oxcarbazepine
D: Oxcarbazepine
Answer: D: Oxcarbazepine 
Explanation: None