The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Ten days after undergoing a cadaveric renal transplant, a 21-year-old man has pain in the right lower abdomen and generalized fatigue. During the past 2 days, he has had decreasing urinary output. He passed 5 liters of urine on the second postoperative day and serum studies showed a creatinine concentration of 2.1 mg/dL. He has adult polycystic kidney disease and was on maintenance hemodialysis for 2 months prior to transplantation. Current medications include azathioprine, cyclosporine, prednisone, and enalapril. He appears lethargic. His temperature is 37.8°C (100°F), pulse is 101/min, and blood pressure is 164/94 mm Hg. Examination shows a healing surgical incision in the right lower abdomen. The graft site shows tenderness to palpation. His blood urea nitrogen concentration is 52 mg/dL, creatinine concentration is 4.1 mg/dL. A biopsy of the transplanted kidney shows tubulitis. C4d staining is negative. Which of the following is the most likely responsible for this patient's findings?   (A) Recipient T-cells in the graft   (B) Drug-induced nephrotoxicity   (C) Fibrosis of the glomerular vessels   (D) Newly formed anti-HLA antibodies "
['(A) Recipient T-cells in the graft <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Recipient T-cells in the graft \n (B) Drug-induced nephrotoxicity \n (C) Fibrosis of the glomerular vessels \n (D) Newly formed anti-HLA antibodies\n" <> possible answers', "  Ten days after undergoing a cadaveric renal transplant, a 21-year-old man has pain in the right lower abdomen and generalized fatigue. During the past 2 days, he has had decreasing urinary output. He passed 5 liters of urine on the second postoperative day and serum studies showed a creatinine concentration of 2.1 mg/dL. He has adult polycystic kidney disease and was on maintenance hemodialysis for 2 months prior to transplantation. Current medications include azathioprine, cyclosporine, prednisone, and enalapril. He appears lethargic. His temperature is 37.8°C (100°F), pulse is 101/min, and blood pressure is 164/94 mm Hg. Examination shows a healing surgical incision in the right lower abdomen. The graft site shows tenderness to palpation. His blood urea nitrogen concentration is 52 mg/dL, creatinine concentration is 4.1 mg/dL. A biopsy of the transplanted kidney shows tubulitis. C4d staining is negative. Which of the following is the most likely responsible for this patient's findings? <> context@"]