question: Q:A 65-year-old man with chronic myelogenous leukemia comes to the physician because of severe pain and swelling in both knees for the past day. He finished a cycle of chemotherapy 1 week ago. His temperature is 37.4°C (99.4°F). Physical examination shows swelling and erythema of both knees and the base of his left big toe. Laboratory studies show:
  Leukocyte count 13,000/mm3
  Serum
  Creatinine 2.2 mg/dL
  Calcium 8.2 mg/dL
  Phosphorus 7.2 mg/dL
  Arthrocentesis of the involved joints is most likely to show which of the following?"? 
  {'A': 'Monosodium urate crystals', 'B': 'Calcium pyrophosphate crystals', 'C': 'Calcium phosphate crystals', 'D': 'Gram-negative diplococci', 'E': 'Gram-positive cocci in clusters'},