This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Newborn Infant - Physical Examination, Subject name: Pediatrics
[{'content': 'LBW is defined as birth weight less than: (Repeat) \nSelect and explain. \nA. 2 kg, B. 1 kg, C. 1.5 kg, D. 2.5 kg', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans: D (. 2.5 kg) Ref: Nelson's Textbook of Pediatrics. 19th EditionExplanation:Some Important Definitions in NeonatologyLow birth weight: Birth weight of less than 2.5 kg irrespective of gestational ageVery low birth weight: Birth weight of less than 1.5 kg irrespective of gestational ageExtremely low hirth weight: Birth weight of less than 1.0 kg irrespective of gestational ageNeonatal: First 28 days of postnatal lifei reterm: Less than 37 completed weeks of gestationsTerm: After 37 completed weeks of gestationsPost term: After 42 completed weeks of gestationsPast Dates: After 40 completed weeks of gestationsStill birth: Delivering dead fetus after 28 weeks of gestation. (Defn changes with country)Abortion: Expulsion of products of conception before 28 weeks of gestation.Small for Gestational Age (SGA): Weight below the 10th percentile for the gestational ageLarge for Gestational Age (LGA): Weight above the 90th percentile for the gestational ageAppropriate for Gestational Age (AGA): Weight between l0th and 90th percentile for the gestational age", 'role': 'assistant'}]