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: Pediatrics
[{'content': 'Extremely low birth weight (ELBW) is called when birth weight is less than _____________ \nSelect and explain. \nA. 2 kg, B. 2.5 kg, C. 1 kg, D. 1.5 kg', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Low Birth weight (LBW) : Birth weight < 2.5kg\nVery low birth weight (VLBW) : Birth weight < 1.5 Kg\nExtremely low birth weight ( ELBW) : Birth weight < 1 Kg', 'role': 'assistant'}]