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': 'Maternal mortality rate (MMR) is expressed as \nSelect and explain. \nA. Per 100,000 births, B. Per 1000 live births, C. Per 100,000 live births, D. Per 1000 births', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]