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
Salter's Scale is a useful method employed in the field to measure: 
Select and explain. 
A. Mid arm Circumference, B. Length at bih, C. Skin fold thickness, D. Bih weight
D: Bih weight
Answer: D: Bih weight 
Explanation: 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.