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: Pediatrics
At  what age upper segment  :  lower segment ratio becomes 1 : 1 ? 
Select and explain. 
A. 3  -  6 years, B. 5  -  8 years, C. 7 - 10 years, D. 10 - 12 years
C: 7 - 10 years
Answer: C: 7 - 10 years 
Explanation: Age
US : LS Ratio




Birth
1.7 : 1


3 years
1.3 : 1


7 - 10 years
1 : 1


> 10 years
0.3 : 1