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: Social & Preventive Medicine
[{'content': 'Neonatal mortality is calculated as – \nSelect and explain. \nA. Number of deaths of children < 28 days per 1000 live birth, B. Number of death of children < 28 days per 1000 still birth, C. Number of death of children < 28 days per 1000 total birth, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]