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
Intracellular water is how much percentage of body weight 
Select and explain. 
A. 40%, B. 60%, C. 25%, D. 80%
A: 40%
Answer: A: 40% 
Explanation: ICF-40% of TBW.(Ref.Textbook of physiology 4th edition page no.24 table 1.3.1)