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': 'Cognitive disorders -a) Deliriumb) Depersonalizationc) Dementiad) Secondary gain \nSelect and explain. \nA. ac, B. bc, C. ad, D. b', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Three groups of cognitive disorder are delirium, dementia and amnestic disorders.', 'role': 'assistant'}]