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': 'Which of following formula denotes free water clearance? \nSelect and explain. \nA. Urine flow rate multiplied by osmolal clearance, B. Urine flow rate minus osmolal clearance, C. Urine flow rate divided by osmolol clearance, D. Urine flow,rate plus osmolal clearance', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is'b'i.e., Urine flow rate minus osmolal clearanceFree water clearance (CH2O):CH2O = V- Cosm", 'role': 'assistant'}]