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': 'All of the following are used to measure ECF volume, excepta) Sucroseb) Sodium chloridec) Inulind) Heavy water \nSelect and explain. \nA. c, B. d, C. ab, D. bd', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Indicators used for fluid volumes\n1.\xa0\xa0\xa0\xa0\xa0\xa0 Total body water (TBW)- Deuterium Oxide D2O, Tritium oxide, Aminopyrine, Antipyrine\n2.\xa0\xa0\xa0\xa0\xa0\xa0 ECF- Inulin, Sucrose, Mannitol, Sodium thiosulphate, Na22\n3.\xa0\xa0\xa0\xa0\xa0\xa0 Plasma volume- Evan’s blue, radioactive iodine labelled serum albumin (I125)\n\xa0\n4.\xa0\xa0\xa0\xa0\xa0\xa0 Blood cell volume- Cr51 labelled RBC', 'role': 'assistant'}]