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': "Korsakoff's psychosis is diagnosed by - \nSelect and explain. \nA. Peripheral neuropathy, B. Visual hallucination, C. Impairment of long term memory, D. Seizures", 'role': 'user'}, {'content': "Answer: C \nExplanation: Memory impairment in korsakoff's syndrome\n\nAntegrade amnesia → New learning impaired.\nRetrograde amnesia → (Loss of memory of past events)\nImpaired recent memory\nRelatively preserved remote memory\nImpairment of explicit (conscious or declarative) type of long-term memory\nRelatively preserved implicit (unconscious or non-declarative) type of long-term memory\n\nDon’t get confuse remote memory with long-term memory. All remote memories are long-term memories. However, not all\nlong-term memories are remote memories. Read below:-\n\nRecent memory includes both short-term (immediate) and long-term (delayed) memory. In Korsakoff's syndrome, recent memory is impaired, that means both short term and long term memories are involved. However, only long-term memory of recent past involved (say, for example, 20-30 minutes or 1 hour).\nRemote memory is long-term memory of more distant past, which is not impaired in Korsakoff's syndrome. Therefore, long-term memory of the distant past (say for example, before the onset of illness) is not impaired.", 'role': 'assistant'}]