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
ECF is how much pa of total body water 
Select and explain. 
A. One third, B. Half, C. Two third, D. None
A: One third
Answer: A: One third 
Explanation: 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)