Urachus fistula is :: (A) Patent allantois, (B) Ectopic hernia, (C) Patent vitello-intestinal tract, (D) Meckel's diveicum
Answer is A. A i.e. Patent allantoisUrorectal septum separates cloaca into (anterior) primitive urogenital sinus and (posterior) primitive anorectal canalQ. Urachzis fistula develops from patent allantoisQ.