question: Q:An 11-year-old man presents with fever and joint pain for the last 3 days. His mother says that he had a sore throat 3 weeks ago but did not seek medical care at that time. The family immigrated from the Middle East 3 years ago. The patient has no past medical history. The current illness started with a fever and a swollen right knee that was very painful. The following day, his knee improved but his left elbow became swollen and painful. While in the waiting room, his left knee is also becoming swollen and painful. Vital signs include: temperature 38.7°C (101.6°F), and blood pressure 110/80 mm Hg. On physical examination, the affected joints are swollen and very tender to touch, and there are circular areas of redness on his back and left forearm (as shown in the image). Which of the following is needed to establish a diagnosis of acute rheumatic fever in this patient?? 
  {'A': 'Elevated erythrocyte sedimentation rate (ESR)', 'B': 'Elevated leukocyte count', 'C': 'No other criterion is needed to establish the diagnosis of acute rheumatic fever', 'D': 'Prolonged PR interval', 'E': 'Positive anti-streptococcal serology'},