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': 'Neonatal period is- \nSelect and explain. \nA. Upto 1 year of life, B. Upto 28 days of life, C. 28 days to 1 year, D. First 7 days of life', 'role': 'user'}, {'content': "Answer: B \nExplanation: Neonatal period is from bih to 28 completed days of life.REF.PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE.Editon-21.Page no.-521", 'role': 'assistant'}]