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': "Which part of the brain is most commonly effected in Alzheimer's disease? \nSelect and explain. \nA. Locus ceruleus, B. Entorhinal cortex, C. Frontal cortex, D. Cerebellum", 'role': 'user'}, {'content': 'Answer: B \nExplanation: "Entorbinal cortex / Medial temporal lobe" is most commonly affected in Alzheimer\'s disease.', 'role': 'assistant'}]