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
The drug used in absence seizures and having a narrow spectrum of antiepileptic activity is : 
Select and explain. 
A. Lamotrigine, B. Ethosuximide, C. Sodium valproate, D. Primidone
B: Ethosuximide
Answer: B: Ethosuximide 
Explanation: None