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': 'Amnesia is found in - \nSelect and explain. \nA. Head injury, B. Mania, C. Schizophrenia, D. Psychiatric state', 'role': 'user'}, {'content': "Answer: A \nExplanation: Amnesia is often caused by a traumatic injury to brain, such as a blow to the head. Other causes are degenerative brain diseases (e.g., Alzheimer's disease), blockage of cerebral blood vessels, infectious diseases, chronic alcoholism, and psychological (dissociative amnesia).", 'role': 'assistant'}]