This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid, Electrolyte, Subject name: Pediatrics
Total body water at bih is:- 
Select and explain. 
A. 90%, B. 75%, C. 60%, D. 30%
B: 75%
Answer: B: 75% 
Explanation: Total body water (TBW) constitutes: 90% of body weight in early fetal life 75% of body weight at bih 60% by the end of 1styear & remains so till pubey