<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 1-year-old boy is brought to the physician by his mother because he has become increasingly pale over the past several months. He has otherwise been healthy. Apart from his maternal grandfather, who had a blood disorder and required frequent blood transfusions since birth, the rest of his family, including his parents and older sister, are healthy. Examination shows conjunctival pallor. Laboratory studies show:Hemoglobin 7.7 gdLMean corpuscular volume 64.8 μm3SerumIron 187 μgdLFerritin 246 ngmLA bone marrow aspirate shows numerous ringed sideroblasts. The patient is most likely deficient in an enzyme responsible for which of the following reactions?? A: Aminolevulinic acid porphobilinogen, B: Glycine succinyl-CoA aminolevulinic acid, C: Glucose-6-phosphate 6-phosphogluconate, D: Protoporphyrin heme, E: Uroporphyrinogen III coproporphyrinogen III,  <response>: This is a question about anemia and enzyme deficiency. The key findings in the stem are:- 1-year-old boy with increasing pallor over months- Low hemoglobin and MCV - Normal iron and ferritin, ruling out iron deficiency- Ringed sideroblasts on bone marrow, indicating issue with heme synthesis- Maternal grandfather had similar issue requiring transfusionsBased on these findings, this is likely a congenital sideroblastic anemia due to a deficiency in an enzyme involved in heme synthesis. The specific enzyme deficiency would cause ringed sideroblasts on the bone marrow.Looking at the choices, choice B involves the enzyme ALA synthase, which is required to convert glycine and succinyl-CoA to ALA as the first step of heme synthesis. A deficiency in this enzyme would lead to sideroblastic anemia with ringed sideroblasts.B: Glycine succinyl-CoA aminolevulinic acid 