This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth and development, Subject name: Pediatrics
Upper segment to lower segment ratio in 3 yr age child is ___________ 
Select and explain. 
A. 1.2, B. 1.3, C. 1.4, D. 1.6
B: 1.3
Answer: B: 1.3 
Explanation: .The U/L ratio (upper body segment :lower body segment) at bih is about 1.7; at age 3 years it is 1.3; at greater than 7 years, it is 1.0 with the upper body segment and lowerbody segment being about equal. Note : higher U/L ratios are noted in sho-limb dwarfism and other bone disorders such as rickets. Reference: GHAI Essential pediatrics, 8th edition