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': 'Definition of low birth weight: \nSelect and explain. \nA. Wt <2.5kg, B. Wt <2kg, C. Wt < 1.5kg, D. Wt <1 kg', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ref: Nelson's Textbook of Pediatrics. 19th EditionExplanation:Some important definitions in Neonatology Low birth weight: Birth weight of less than 2.5 kg irrespective of gestational age Very low birth weight: Birth weight of less than 1.5 kg irrespective of gestational age.Extremely low birth weight: Birth weight of less than 1.0 kg irrespective of gestational ageNeonatal: First 28 days of postnatal life.Preterm: 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 I Oth percentile for the gestational age Large for Gestational Age (LGA): Weight above the 90th percentile for the gestational age Appropriate for Gestational Age (AGA): Weight between 10lh & 90th percentile for the gestational age", 'role': 'assistant'}]