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 the following has no Tm value ? \nSelect and explain. \nA. Albumin, arginine, B. Betahydroxybutyrate, glucose, C. Glucose haemoglobin, phosphate, D. Urea', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Urea', 'role': 'assistant'}]