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': 'The chracteristic symptom of organic psychosis is \nSelect and explain. \nA. Hallucination, B. Depression, C. Transient Delusion, D. Anxiety', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Transient delusions', 'role': 'assistant'}]