question: Q:A 40-year-old woman comes to the emergency department due to severe right flank pain, fever, chills, and decreased urine output. The vital signs include a temperature of 39.0°C (102.2°F), heart rate of 120/min, a regular breathing pattern, and blood pressure of 128/70 mm Hg. Cardiopulmonary auscultation is normal. In addition, tenderness is elicited by right lumbar percussion. After initiating intravenous antibiotics empirically, the condition of the patient improves significantly. However, a low urine output persists. The results of the ordered laboratory tests are as follows:
  Urine culture Proteus mirabilis, > 150,000 CFU/mL (normal range: < 100,000 CFU/mL to no bacterial growth in asymptomatic patients)
  Density 1.030; Leukocyte esterase (+); Nitrites (+)
  pH 7.8 (normal range: 4.5–8.0)
  C-reactive protein 60 mg/dL (normal range: 0–10 mg/dL)
  Serum creatinine 1.8 mg/dL (normal range: 0.6–1.2 mg/dL)
  BUN 40 mg/dL (normal range: 7–20 mg/dL)
  Plain abdominal film Complex renal calculus in the right kidney
  Which of the following is the most likely type of stone the patient has?? 
  {'A': 'Xanthine', 'B': 'Uric acid', 'C': 'Cystine', 'D': 'Struvite', 'E': 'Calcium oxalate'},