<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A child is in the nursery one day after birth. A nurse notices a urine-like discharge being expressed through the umbilical stump. What two structures in the embryo are connected by the structure that failed to obliterate during the embryologic development of this child?? A: Pulmonary artery - aorta, B: Bladder - yolk sac, C: Bladder - small bowel, D: Liver - umbilical vein, E: Kidney - large bowel,  <response>: This is a question about embryologic development. The key details are that there is urine-like discharge from the umbilical stump in a newborn, meaning there is a connection between the bladder and the umbilical cord that failed to close off during development. This suggests a patent urachus, which is a connection between the bladder and the umbilical cord. B: Bladder - yolk sac 