<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 3-year-old boy presents with progressive lethargy and confusion over the last 5 days. He lives with his parents in a home that was built in the early 1900s. His parents report that his tummy has been hurting for the last 3 weeks and that he is constipated. He eats and drinks normally, but occasionally tries things that are not food. Abdominal exam shows no focal tenderness. Hemoglobin is 8 gdL and hematocrit is 24. Venous lead level is 55 ugdL. Which therapy is most appropriate for this boys condition?? A: Deferoxamine, B: Folic acid, C: Docusate, D: Succimer, E: Psyllium,  <response>: This is a case of lead poisoning in a young child likely due to exposure from living in an old home. The key findings are progressive lethargy, confusion, abdominal pain, constipation, pica eating non-food items, anemia, and an elevated blood lead level of 55 ugdL. Succimer DMSA is a chelating agent that binds to lead and promotes its excretion in urine. It is the treatment of choice for lead poisoning with blood levels 45 ugdL. Deferoxamine A is used for iron overload, folic acid B for megaloblastic anemia, docusate C for constipation, and psyllium E for constipation. Therefore, the most appropriate therapy is succimer. D: Succimer 