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': 'ECF is how much pa of total body water \nSelect and explain. \nA. One third, B. Half, C. Two third, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Extracellular fluid is 1/3rd pa of total body water . While intracellular fluid Table 1.3.1 (Ref: Textbook of physiology AK Jain 4th edition page no.24)', 'role': 'assistant'}]