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
[{'content': 'The drug used in absence seizures and having a narrow spectrum of antiepileptic activity is : \nSelect and explain. \nA. Lamotrigine, B. Ethosuximide, C. Sodium valproate, D. Primidone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]