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: Medicine
[{'content': 'The antiepileptic drug effective in Lennox-Gastaut syndrome is: \nSelect and explain. \nA. Lamotrigine, B. Gabapentin, C. Tiagabine, D. Primidone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lamotrigine is the most effective drug among the given options. Ref: Harrisons principles of internal medicine, 18 th edition ; Page : 3263, Table : 369/9.', 'role': 'assistant'}]