<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 3080-g 6-lb 13-oz male newborn is delivered at term to a 27-year-old woman, gravida 2, para 1. Pregnancy was uncomplicated. He appears pale. His temperature is 36.8C 98.2F, pulse is 167min, and respirations are 56min. Examination shows jaundice of the skin and conjunctivae. The liver is palpated 23 cm below the right costal margin, and the spleen is palpated 12 cm below the left costal margin. The lungs are clear to auscultation. No murmurs are heard. His hemoglobin concentration is 10.6 gdL and mean corpuscular volume is 73 μm3. Hemoglobin DNA testing shows 3 missing alleles. Which of the following laboratory findings is most likely present in this patient?? A: Low reticulocyte count, B: Elevated HbF, C: Low serum ferritin, D: Increased hemoglobin Barts concentration, E: Elevated HbA2n,  <response>: This is a question about a newborn with signs and symptoms of hemolytic disease of the newborn HDN due to alpha thalassemia, including pallor, jaundice, hepatosplenomegaly, anemia, and microcytosis. The key finding in the stem is that hemoglobin DNA testing shows 3 missing alpha globin alleles, indicating alpha thalassemia trait in the parents. In alpha thalassemia, there is reduced or absent production of alpha globin chains. This leads to excess beta globin chains forming tetramers called hemoglobin Barts Hb Barts which has very high oxygen affinity and poor oxygen delivery to tissues. Therefore, the lab finding most likely to be elevated in this patient with HDN due to alpha thalassemia is hemoglobin Barts.D: Increased hemoglobin Barts concentration 