This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
[{'content': 'Neurotransmitter implicated in pleasure-seeking behavior \nSelect and explain. \nA. Dopamine, B. Serotonin, C. Nor epinephrine, D. GABA', 'role': 'user'}, {'content': "Answer: A \nExplanation: Focus on Dopamine Scientists probed fuher to see if they could link the brain's reward systems to a paicular set of chemical mechanisms. They soon found that blocking the neurotransmitter dopamine seems to reduce an animal's pleasure-seeking drives. For example, depleting dopamine in the brain causes animals to become oblivious to food and other normally pleasurable rewards. Ref: guyton and hall textbook of medical physiology 12 edition", 'role': 'assistant'}]