This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CNS, Subject name: Pharmacology
An antiepileptic drug 'A' can also be used for the treatment of postherpetic neuralgia and pain due to diabetic neuropathy. Which of the following can be the agent 'A'? 
Select and explain. 
A. Carbamazepine, B. Gabapentin, C. Lamotrigine, D. Primidone
B: Gabapentin
Answer: B: Gabapentin 
Explanation: Gabapentin and progabide act by increasing the release of GABA. Gabapentin is the drug of choice for post-herpetic neuralgia and diabetic neuropathy.