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': 'Which one of the following acts as the major neurotransmitter in substantia nigra \nSelect and explain. \nA. Serotonin, B. Acetylcholine, C. Dopamine, D. Noradrenaline', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (C) Dopamine > The long dopamine systems are the nigrostriatal system, which projects from the substantia nigra to the striatum and is involved in Motor control.', 'role': 'assistant'}]