This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
A newborn doubles his height at bih by what age? 
Select and explain. 
A. 2 & half years, B. 3 & half years, C. 4 & half years, D. 5 & half years
C: 4 & half years
Answer: C: 4 & half years 
Explanation: Height at bih is 50cms At 6 months- 65 cms At 1yr- 75cms At 2yrs- 90cms At 3yrs- 95cms At 4yrs- 100cms Hithero, height at bih doubles by the age of 4 yrs. Ref: Ghai, 9th edition, Chapter 2.