This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, 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. Valporate, B. Pregbalin, C. Levetiracetam, D. Oxcarbazepine
D: Oxcarbazepine
Answer: D: Oxcarbazepine 
Explanation: Oxcarbazepine is newer congener of carbamazepine and is rapidly conveed to active metabolite that is only glucuronide conjugated but not oxidized. Ref KD Tripati 8thh ed.