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': 'An 8-year-old child suffering from recurrent attacks of polyurea since childhood presents to the paediatrics OPD. On examination, the child is short statured vitals and BP are normal. Serum Creatinine - 6 mg%,HCO3 - 16 meq, Na - 134, K+ 4.2 . On USG, bilateral small kidneys are seen. Diagnosis is - \nSelect and explain. \nA. Reflux Nephropathy, B. Juvenile Nephronophthisis, C. Polycystic kidney disease, D. Medullary cystic kidney disease', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]