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 it to : \nSelect and explain. \nA. Acetylcholine, B. GABA, C. Serotinin, D. Dopamine", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Acetyl choline', 'role': 'assistant'}]