This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Paediatric Care in RCH: BW, BL, PEM, Breast Feeding, Subject name: Social & Preventive Medicine
[{'content': "Field instrument used to measure bih weight:- \nSelect and explain. \nA. Salter's spring balance, B. Electronic weighing scale, C. Mass produced balance scale, D. Roberval balance", 'role': 'user'}, {'content': "Answer: A \nExplanation: - Field instrument to measure bih weight is Salter's Spring balance (kind of sling balance on which child is hung) - Average bih weight = 2.8kg - According to WHO, Low bih weight = < 2.5kg Very Low bih weight = < 1.5 Kg Extremely Low bih weight = < 1 Kg - Bih weight Doubles by 5 months Triples by 12 months Quadruples by 2yrs", 'role': 'assistant'}]