This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'Low birth weight (LBW) is defined as a birth weight of less than ___ as per the World Health Organization (WHO) \nSelect and explain. \nA. 1.0 kg, B. 2.5 kg, C. 2.0 kg, D. 1.5 kg', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. B 2.5 kg (Ref. The incidence of low birthweight, defined as the proportion of newborns weighing less than 2,500 grams, is monitored through both health system surveillance and household surveys. In 2013, nearly 22 million newborns--an estimated 16 per cent of all babies born globally that year--had low birthweight. Accurate monitoring is challenging, however, since nearly half of the world's infants are not weighed at birth.", 'role': 'assistant'}]