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: Physiology
[{'content': 'Normal excretion of protein in urine per day is: \nSelect and explain. \nA. 100 mg, B. 150 mg, C. 400 mg, D. 600 mg', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. 100 mgThe amount of protein in urine is normally less than 100ing/ dayQ. Most of this is not filtered and comes from shed tubular cells.', 'role': 'assistant'}]