Urachus fistula is a remanant of ?: (A) Yolk sac, (B) Allantois, (C) Chorion, (D) Amnion
Answer is B. Urachus fistula is a remnant of allantoic diveiculum If patent urachus in adults, urine dribbles from umbilicus known as wheeping umbilicus Inderbir Singh's Human embryology Pg 97