This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'Unilateral renal agenesis is associated with - \nSelect and explain. \nA. Polycystic disease of pancreas, B. Hiatus Hernia, C. Single umbilical artery, D. Hypogonadism', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]