<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A newborn boy born vaginally to a healthy 37-year-old G3P1 from a pregnancy complicated by hydramnios fails to pass meconium after 24 hours of life. The vital signs are within normal limits for his age. The abdomen is distended, the anus is patent, and the rectal examination reveals pale mucous with non-pigmented meconium. Based on a barium enema, the boy is diagnosed with sigmoid colonic atresia. Disruption of which structure during fetal development could lead to this anomaly?? A: Celiac artery, B: Vitelline duct, C: Superior mesenteric artery, D: Inferior mesenteric artery, E: Cloaca,  <response>: This is a question about the embryological development of the gastrointestinal tract. The key details in the stem are that a newborn boy has sigmoid colonic atresia, meaning a blockage or narrowing of the sigmoid colon. This indicates a disruption in the normal development of the colon during fetal development. The choices list different anatomical structures that are involved in the development of the gastrointestinal tract. To determine which one is most relevant for sigmoid colonic atresia, we need to consider which developmental process specifically affects the sigmoid colon. The sigmoid colon develops from the hindgut, which receives its blood supply from the inferior mesenteric artery. Therefore, a disruption in the development of the inferior mesenteric artery could lead to sigmoid colonic atresia.D: Inferior mesenteric artery 