This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Development, and Behavior, Subject name: Pediatrics
What is this instrument used for? 
Select and explain. 
A. Measure weight, B. Measure height, C. Measure length, D. Measure upper segment: lower segment ratio
C: Measure length
Answer: C: Measure length 
Explanation: c. Measure lengthThe instrument shown in the picture is an 'Infantometer'. Infantometer is a horizontal rod with a ruler with 2 vertical boards on 2 ends (one fixed and other moveable), used to measure length of an infant.