<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:An 18-month-old boy is brought in by his parents because of failure to gain weight. This patients pregnancy and spontaneous transvaginal delivery were uneventful. His vital signs include: temperature 37.0C 98.6F, blood pressure 10257 mm Hg, pulse 97min. His height is at the 30th percentile and weight is at the 25th percentile for his age and sex. Physical examination reveals generalized pallor, mild scleral icterus, and hepatosplenomegaly. Laboratory results are significant for the following:Hemoglobin 8.9 gdLMean corpuscular volume MCV 67 μm3Red cell distribution width 12.7 White blood cell count 11,300mm3Platelet count 420,000mm3A plain radiograph of the patients skull is shown in the exhibit see image. Which of the following is the predominant type of hemoglobin in this patient?? A: Hemoglobin Bart, B: Hemoglobin F, C: Hemoglobin A, D: Hemoglobin A2, E: Hemoglobin S,  <response>: Based on the information provided in the question stem, this 18-month-old boy has failure to gain weight, pallor, jaundice, hepatosplenomegaly, low hemoglobin, low MCV, high RDW, and skull x-ray findings consistent with thalassemia. The low MCV and high RDW indicate a microcytic anemia, while the age of the patient and ethnicity make thalassemia likely. In beta thalassemia, there is impaired production of beta globin chains, leading to relative excess of alpha globin chains. This results in an increase in Hemoglobin A2 and Hemoglobin F levels. Therefore, the predominant hemoglobin in this patient is most likely Hemoglobin F.B: Hemoglobin F 