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: Pediatrics
[{'content': 'All the following are causes of hematuria in a child except: \nSelect and explain. \nA. PCKD, B. Porphyria, C. Renal vein thrombosis, D. Idiopathic hypercalciuria', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cause of Persistent microscopic hematuria include idiopathic hypercalciuria. Porphyria does not produce hematuria. Ref: Nelson, 18th Edition, Page 2169', 'role': 'assistant'}]