question: Q:A 55-year-old woman presents with fatigue. She says her symptoms are present throughout the day and gradually started 4 months ago. Her past medical history is significant for rheumatoid arthritis–treated with methotrexate, and diabetes mellitus type 2–treated with metformin. The patient is afebrile, and her vital signs are within normal limits. A physical examination reveals pallor of the mucous membranes. Initial laboratory tests show hemoglobin of 7.9 g/dL, hematocrit of 22%, and mean corpuscular volume of 79 fL. Which of the following is the best next diagnostic step in this patient?? 
  {'A': 'Serum ferritin level', 'B': 'Serum ferritin and serum iron levels', 'C': 'Serum ferritin level and total iron-binding capacity (TIBC)', 'D': 'Serum ferritin and soluble transferrin receptor levels', 'E': 'Serum iron level'},