This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Subject name: Pediatrics
[{'content': "Salter's Scale is a useful method employed in the field to measure: \nSelect and explain. \nA. Mid arm Circumference, B. Length at bih, C. Skin fold thickness, D. Bih weight", 'role': 'user'}, {'content': "Answer: D \nExplanation: Bathroom weighing scale is unreliable instrument for measuring weight of children For field conditions, Salter's Spring Scale is quite satisfactory as it is easy to carry.", 'role': 'assistant'}]