This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Excitation and Action Potiential, Subject name: Physiology
[{'content': '_______________ is the major excitatory neurotransmitter in the brain. \nSelect and explain. \nA. Ach, B. Aspaate, C. GABA, D. Glutamate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Glutamate is the major excitatory neurotransmitter; 60% of brain synapses are glutamatergic. GABA is the major inhibitory neurotransmitter and can be localized by using glutamic acid decarboxylase as a marker. A delta fibers which carry sharp pricking pain also release Glutamate.', 'role': 'assistant'}]