question: Q:A 13-year-old Hispanic boy is brought to the physician by his mother because of left groin pain for 1 month. The pain radiates to his left knee and is aggravated on walking. He fell during soccer practice 5 weeks ago but did not see a doctor about it and does not recall any immediate and persistent pain after the event. He has hypothyroidism. His only medication is levothyroxine. His immunizations are up-to-date. He appears uncomfortable. He is at the 50th percentile for height and at the 95th percentile for weight. His temperature is 37.1°C (98.9°F), pulse is 77/min, respirations are 14/min, and blood pressure is 100/70 mm Hg. The patient has a left-sided, antalgic gait. The left lower extremity is externally rotated. The left hip is tender to palpation and internal rotation is limited by pain. Laboratory studies show:
  Hemoglobin 13.1 g/dL
  Leukocyte count 9,100/mm3
  Platelet count 250,000/mm3
  Serum
  TSH 3.6 μU/mL
  Which of the following is the most likely diagnosis?"? 
  {'A': 'Septic arthritis of the left hip', 'B': 'Slipped capital femoral epiphysis', 'C': 'Osteomyelitis of the left hip', 'D': 'Transient synovitis', 'E': 'Developmental dysplasia of the left hip'},