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
Mechanism of action of Levetiracetam is 
Select and explain. 
A. Blocking SV2A protein, B. Inhibiting reuptake of GABA, C. Inhibiting GABA transaminase enzyme, D. Calcium channel blocker
A: Blocking SV2A protein
Answer: A: Blocking SV2A protein 
Explanation: Levetiracetam blocks SV2A which is a synaptic vesicular protein & inhibits release of excitatory neurotransmitters.