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': 'Mechanism of action of Levetiracetam is \nSelect and explain. \nA. Blocking SV2A protein, B. Inhibiting reuptake of GABA, C. Inhibiting GABA transaminase enzyme, D. Calcium channel blocker', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Levetiracetam blocks SV2A which is a synaptic vesicular protein & inhibits release of excitatory neurotransmitters.', 'role': 'assistant'}]