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. Ahritis, B. Carditis, C. Chorea, D. Nodules', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Ahritis Ahritis in RF It is the most frequent major manifestation (75% of cases). o It is migratory polyahritis, i.e., several joints are involved in quick succession and each for a brief period of time. o Any joint may be affected but involvement of large joints such as knee, ankle, elbow, and wrist is common. Small joints of hands and feet are not involved. o Inflammation of any one joint subside spontaneously within a week and the entire bout of polyahritis rarely last more than 4 weeks. Resolution is complete with no residual joint damage. o A striking feature is dramatic response to salicylates.", 'role': 'assistant'}]