This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Plasma volume is best evaluated by using? \nSelect and explain. \nA. Evan blude, B. Inulin, C. Mannitol, D. Radoplabelled water', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Plasma volume is measured using dyes like Evans blue that binds specifically to plasma proteins. (Ref: Textbook of physiology N Geetha 2 nd edition page no.62)', 'role': 'assistant'}]