This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: congenital anomalies of kidney, Subject name: Pediatrics
[{'content': 'Unilateral renal agenesis is associated with: \nSelect and explain. \nA. Polycystic disease of pancreas, B. Hiatus Hernia, C. Single umbilical aery, D. Hypogonadism', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Malformations associated with unilateral renal agenesis are: Single umbilical aery Contralateral vesicoureteric reflux Absent ureter Absent ipsilateral vas deferens.', 'role': 'assistant'}]