This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
[{'content': 'Which of the following is the most common renal cystic disease in infants is - \nSelect and explain. \nA. Polycystic kidney, B. Simple renal cyst, C. Unilateral renal dysplasia, D. Calyceal cyst', 'role': 'user'}, {'content': "Answer: C \nExplanation: In unilateral renal dysplasia, one kidney does not develop properly in the womb. ('Unilateral' means one side.) Most children born with one dysplastic kidney have no complications and do not need special treatment. Sometimes the other kidney grows larger than normal to make up for the dysplastic kidney Ref Harrison20th edition pg 267", 'role': 'assistant'}]