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': 'The raphe nuclei located in lower pons and medulla secrete the following neurotransmitter \nSelect and explain. \nA. Norepinphrine, B. Dopamine, C. Serotonin, D. Acetycholine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Serotonin is also found within the brain stem in the midline raphe nuclei which project to poions of hypothalamus, limbic system, neocoex, cerebellum and spinal cord. Ref: Ganong&;s review of medical physiology; 23rd edition; pg: 136', 'role': 'assistant'}]