This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Malnutrition, Subject name: Pediatrics
What is this device used by health workers to assess nutritional status of under-5 children? 
Select and explain. 
A. Harpenden callipers, B. Shakir's tape, C. Orchidometer, D. Infantometer
B: Shakir's tape
Answer: B: Shakir's tape 
Explanation: This device used by health workers to assess nutritional status of under-5 children - Shakir's tape Used to measure mid upper arm circumference (MUAC) Red zone- severe malnutrition Yellow zone- mild to moderate malnutrition Green zone- normal