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': 'True regarding secondary prophylaxis of a 6 year old child with carditis is: March 2005 \nSelect and explain. \nA. Duration of prophylaxis is life long, B. Duration of prophylaxis is till 18 years, C. Duration of prophylaxis is at least 5 years after onset, D. Duration of prophylaxis is till 25 years of age', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Duration of prophylaxis is till 25 years of age The duration of prophylaxis differs from case to case. In patient without proven carditis: This drug prophylaxis may be given till the child reaches 18 years of age, or for five years after the last attack of RF /RHD (whichever is longer). In patient with proven carditis: This drug prophylaxis may be given till the child reaches 25 years of age, or for ten years after the last attack of RF /RHD (whichever is longer). Drug prophylaxis may be required almost forever/lifelong, especially in cases which exhibit permanent signs of valvular /rheumatic hea disease or after valvular surgery. These damaged valves need foolproof protection against infection, and due to this reason, drug prophylaxis is given continuously.', 'role': 'assistant'}]