question: Q:A 55-year-old woman presents with fatigue and flu-like symptoms. She says her symptoms started 5 days ago with a low-grade fever and myalgia, which have not improved. For the past 4 days, she has also had chills, sore throat, and rhinorrhea. She works as a kindergarten teacher and says several children in her class have had similar symptoms. Her past medical history is significant for depression managed with escitalopram, and dysmenorrhea. A review of systems is significant for general fatigue for the past 5 months. Her vital signs include: temperature 38.5°C (101.3°F), pulse 99/min, blood pressure 115/75 mm Hg, and respiratory rate 22/min. Physical examination reveals pallor of the mucous membranes. Initial laboratory findings are significant for the following:
  Hematocrit 24.5%
  Hemoglobin 11.0 g/dL
  Platelet Count 215,000/mm3
  Mean corpuscular volume (MCV) 82 fL
  Red cell distribution width (RDW) 10.5%
  Which of the following is the best next diagnostic test in this patient?? 
  {'A': 'Reticulocyte count', 'B': 'Serum folate level', 'C': 'Serum ferritin level', 'D': 'Serum iron level', 'E': 'Hemoglobin electrophoresis'},