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: Psychiatry
[{'content': "Biochemical etiology of Alzheimer's disease relates to \nSelect and explain. \nA. Serotonin, B. Dopamine, C. Acetylcholine, D. GABA", 'role': 'user'}, {'content': "Answer: C \nExplanation: Neurotransmitters, which are decreased in Alzheimer's disease:- Acetylcholine (most important), norepinephrine, somatostatin, corticotropin.", 'role': 'assistant'}]