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': 'In schizophrenia, characteristic feature is: \nSelect and explain. \nA. Formal thought disorder, B. Delusion, C. Hallucination, D. Apathy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Formal thought disorder', 'role': 'assistant'}]