This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Newborn Infant - Delivery Room and Nursery Care, Subject name: Pediatrics
[{'content': 'Neonatal period extends up to: \nSelect and explain. \nA. 21 days of life, B. 30 days of life, C. 28 days of life, D. 35 days of life', 'role': 'user'}, {'content': "Answer: C \nExplanation: c. 28 days of life(Ref: Nelson's 20/e p 789-791, Ghai 8/e p 124-125)Neonatal period extends from birth to under 4 weeks (<28 days) of age, of which early neonatal period refers to 1st week of life (<7 days)", 'role': 'assistant'}]