A 30-year-old woman is admitted to the hospital with progressive fatigue and weakness with dyspnea on exertion. On physical examination the following is found: temperature of 39 Celsius, pulse: 110 bpm, respiratory rate: 16/min, and blood pressure: 110/70 mmHg. The woman has profound scleral icterus and lymphadenopathy. Blood count reveals: WBC: 9,000/ul, hemoglobin: 5.3 g/dl, Hct: 16%, RBC: 1,600,000/ul, platelet count: 300,000/ul, reticulocyte count: 15%. Which of the following types of anemia is the most likely cause for the patient’s presentation?