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: Physiology
[{'content': 'Which of the following is an aminoneuro-transmitter \nSelect and explain. \nA. Acetylcholine, B. GABA, C. Lignocaine, D. Epinephrine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. GABA', 'role': 'assistant'}]