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: Microbiology
[{'content': 'Mechanism of action of tetanospasmin \nSelect and explain. \nA. Inhibition of GABA release, B. Inhibition cAMP, C. Inactivation of Ach receptors, D. Inhibition of cGMP', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Inhibition of GABA release . Tetanospasmin blocks the release of inhibitory neurotransmitters (GABA and glycine) in brain-stem and spinal cord.", 'role': 'assistant'}]