This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology and Rheumatology, Subject name: Medicine
[{'content': "The commonest feature in Poncet's disease is? \nSelect and explain. \nA. Joint pains, B. Hemoptysis, C. Headache, D. Vascular collapse", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. A. Joint painsPoncet's disease, is a reactive symmetric form of polyarthritis that affects persons with visceral or disseminated tuberculosis. No mycobacteria are found in the joints, and symptoms resolve with antituberculous therapy.", 'role': 'assistant'}]