<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A mother brings her 3-day-old son to the pediatrician with a concern over drops of a clear yellow discharge from the clamped umbilical cord. These drops have formed every few hours every day. The vital signs are within normal limits and a cursory physical shows no abnormalities. On closer examination, the discharge is shown to be urine. The skin around the umbilical cord appears healthy and healing. The umbilical cord is appropriately discolored. An ultrasound shows a fistula tract that connects the urinary bladder and umbilicus. Which of the following structures failed to form in this patient?? A: Lateral umbilical ligament, B: Round ligament of the liver, C: Medial umbilical ligament, D: Median umbilical ligament, E: Falciform ligament,  <response>: This is a medical question asking about a newborn with urine leaking from the umbilicus, indicating a connection between the bladder and umbilicus. The question asks which anatomical structure failed to form properly in this patient. Based on the description, this is likely an umbilical urinary fistula, meaning there is an abnormal connection between the bladder and umbilicus due to failure of the urachus to close during fetal development. The urachus normally obliterates prenatally to become the median umbilical ligament. Failure of this ligament to form properly is the likely anatomical explanation for the umbilical urinary fistula in this infant.The other anatomical structures listed are not directly related to closure of the urachus. The lateral umbilical ligaments, round ligament of the liver, and falciform ligament are not involved in urachus closure. The medial umbilical ligament forms from the obliterated umbilical arteries and veins, not the urachus.Therefore, the answer is likely choice D, as failure of the median umbilical ligament to form properly is the anatomical explanation for this infants umbilical urinary fistula.D: Median umbilical ligament 