This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epilepsy, Subject name: Pharmacology
[{'content': 'What is the mechanism of action of levetiracetam? \nSelect and explain. \nA. Antagonist of GABAA receptor, B. Bind to synaptic vesicular protein SV2A, C. Inhibit voltage gated Ca+ channel, D. Inhibit Na+ channel', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Levetiracetam is an anti-epileptic drug that works by binding to SV2A, a ubiquitous synaptic vesicle integral membrane protein, which functions as a positive effector of synaptic vesicle exocytosis. Binding to SV2A in the vesicle reduces the release of the excitatory neurotransmitter glutamate. It is used for treatment of focal seizures GTCS, JME', 'role': 'assistant'}]