This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Body Fluids, Subject name: Physiology
ECF is how much part 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: Ans. is 'a' i.e.. One third Extracellular fluid (14 litres)o 20% of body weighto 33% of total body waterExtracellular fluid (14 litres)o 20% of body weighto 33% of total body wraterIntracellular fluid (ICF)Plasmao 3.5 litreso 5% of body weighto 8% of total body watero 25% of ECFo 28 litreso 40% of body weighto 67% of total body waterInterstitial fluido 10.5 litreso 15% of body weighto 25% of total body watero75% of ECF Total body water (42 litres)o 60% of body weight