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: Medicine
[{'content': 'All of the following are seen in inflammatory polyarthritis, except - \nSelect and explain. \nA. New bone formation, B. Spontaneous flare, C. Increased ESR, D. Morning stiffness more than one hour', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]