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
[{'content': 'What is this instrument used for? \nSelect and explain. \nA. Measure weight, B. Measure height, C. Measure length, D. Measure upper segment: lower segment ratio', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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.", 'role': 'assistant'}]