question: Q:A 6-year-old boy is brought to the physician because of headache, cough, runny nose, and a low-grade fever since waking up that morning. He has been healthy except for a urinary tract infection one week ago that has resolved with trimethoprim-sulfamethoxazole therapy. Both parents have a history of allergic rhinitis. His temperature is 37.8°C (100°F). Physical exam shows rhinorrhea and tenderness over the frontal and maxillary sinuses. There is cervical lymphadenopathy. Laboratory studies show:
  Hemoglobin 14.2 g/dL
  Leukocyte count 2,700/mm3
  Segmented neutrophils 30%
  Bands 1%
  Eosinophils 4%
  Basophils 0%
  Lymphocytes 56%
  Monocytes 9%
  Platelet count 155,000/mm3
  Which of the following is the most likely underlying cause of this patient's symptoms?"? 
  {'A': 'Medication side effect', 'B': 'Acute lymphocytic leukemia', 'C': 'CMV infection', 'D': 'EBV infection', 'E': 'Acute myelogenous leukemia'},