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': 'Elimination of waste product from a normal person requires a minimal amount of urine of \nSelect and explain. \nA. 100 ml, B. 500 ml, C. 100 ml, D. 2000 ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: For excretion of solutes (waste products) from kidney:-\nNormal (at a concentration of 290 mOsm/L) → 1 litre of urine per day is required.\nWhen there is maximum concentration (1400 mOsm/L) → Only 500 ml of urine per day is required.\nWhen there is maximum dilution (30-50 mOsm/L) → 23.3 L of urine is required.', 'role': 'assistant'}]