This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Forensic Medicine
At what age, does the bih length doubles: UPSC 07; FMGE 10, 11 
Select and explain. 
A. 1 year, B. 2 years, C. 3 years, D. 4 years
D: 4 years
Answer: D: 4 years 
Explanation: Ans. 4 years