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': "Loosening of association is an example of: \nSelect and explain. \nA. Formal thought disorder, B. Schneider's first symptoms, C. Perseveration, D. Concrete thinking", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Formal thought disorder', 'role': 'assistant'}]