This 17-year-old boy also reports dark urine, bilateral knee pain, and intermittent abdominal pain. Which of the following is true regarding this condition?

A. It is more common in adults than children

B. A DIF biopsy showing intravascular IgA deposition is diagnostic

C. It usually occurs after a respiratory tract infection

D. He has a high likelihood of developing permanent renal impairment

E. Azathioprine is the treatment of choice

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