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': 'Orthostatic proteinuria - \nSelect and explain. \nA. Seen in recumbant position, B. Is benign, C. Future risk of nephrotic synd, D. > 300 mg/day', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]