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': 'Projections from substantia nigra pars compacta to striatum releases \nSelect and explain. \nA. GABA, B. Dopamine, C. Glutamate, D. Aspartate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]