This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Physiology
[{'content': '1-125 labelled albumin is used for measurement of: \nSelect and explain. \nA. Plasma volume, B. Interstitial fluid volume, C. ICF, D. ECF', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) Plasma volumeRef: Ganong's Review of Medical Physiology 25th Ed; Page No-31Indicators used for Body fluids measurementCompartmentIndicator usedTotal body water 2H2 O (Deuterium oxide), 3H2 O (Tritium Oxide), AntipyrineExtracellular fluid 22Na, 125L-iothalamate, Thiosulfate, Inulin, SucroseIntracellular fluidCalculated as Total body water - Extracellular fluid volume.Plasma volume 125L-Albumin, Evans blue dye (T-1824)(Mn:PIE)Blood volume 51Cr-labeled red blood cells, or calculated as Blood volume = Plasma volume/ (1-Hematocrit)Interstitial fluidCalculated as Extracellular fluid volume - Plasma volume", 'role': 'assistant'}]