This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'RHD diagnostic criteria include \nSelect and explain. \nA. Oral ulcer, B. Malar rash, C. Erythema marginatum, D. Nail telengectasia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Erythema marginatum is a cutaneous finding associated with acute rheumatic fever. The lesions typically develop 7 days to months after the onset of the streptococcal pharyngitis or, rarely, streptococcal skin infections. Erythema marginatum occurs in about 10% cases of acute rheumatic fever. Jones criteria is used for diagnosis of rheumatic fever . Its shown in the following picture Ref Davidson edition23rd pg 532', 'role': 'assistant'}]