This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: obstetrics,pediatrics and geriatrics, Subject name: Social & Preventive Medicine
[{'content': 'As per WHO low bih weight is defined as - \nSelect and explain. \nA. Bihh weight less than 2.5kg, B. Bih weight < 10th percentile, C. Gestational age < 34 weeks, D. Gestational < 28 weeks', 'role': 'user'}, {'content': 'Answer: A \nExplanation: According to WHO , low bih weight is defined as bih weight of less than 2.5 kg. Hence option 1 is the most appropriate answer. Coming to other options, Option 2- bih weight less than 10th percentile for gestational age is known as small for date babies Option3and 4, Extremely preterm is less than 28 wks Very preterm is 28-32 weeks Moderate to late preterm is 32 to 37 weeks Reference Park&;s textbook of preventive and social medicine 23rd edition pg 536', 'role': 'assistant'}]