question: Q:A 12-year-old boy is found on a routine auditory screening to have mild high frequency hearing impairment. On exam, he has no ear pain, no focal neurological deficits, and no cardiac murmurs. He has not had any recent illness. Laboratory studies show:
  
  Serum:
  Creatinine: 0.7 mg/dl
  Protein: 3.8 g/dl
  Antistreptolysin O titer: 60 Todd units (12-166 normal range)
  
  Urinalysis:
  Microscopic heme
  Protein: 4+
  RBCs: 6/hpf
  
  A kidney biopsy is taken. Which of the following findings is most characteristic of this patient’s disease?? 
  {'A': '“Basket-weave” pattern of basement membrane on electron microscopy', 'B': 'Crescent-moon shapes on light microscopy', 'C': 'Large eosinophilic nodular lesions on light microscopy', 'D': 'Thickened “tram-track” appearance of basement membrane on electron microscopy', 'E': '“Spike and dome” appearance on electron microscopy'},