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: Pediatrics
[{'content': 'Most common manifestation of rheumatic fever – \nSelect and explain. \nA. Arthritis, B. Carditis, C. Chorea, D. Nodules', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Arthritis in RF \n\nIt is the most frequent major manifestation (75% of cases).\nIt is migratory polyarthritis, i.e., several joints are involved in quick succession and each for a brief period of time.\nAny joint may be affected but involvement of large joints such as knee, anlde, elbow, and wrist is common.\nSmall joints of hands and feet are not involved.\nInflammation of any one joint subside spontaneously within a week and the entire bout of polyarthritis rarely last more than 4 weeks.\nResolution is complete with no residual joint damage.\nA striking feature is dramatic response to salicylates.', 'role': 'assistant'}]