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': 'Perinatal mortality is expressed in terms of – \nSelect and explain. \nA. Deaths/1000 total births, B. Deaths/1000 live births, C. Deaths/10000 total births, D. Deaths/10000 live births', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]