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': 'The number of abortions performed divided by the number of live births in the same period is known as- \nSelect and explain. \nA. Abortion rate, B. Abortion incidence, C. Abortion prevalence, D. abortion ratio', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Abortion ratio\xa0\n\nThis is calculated by dividing the number of abortions performed during a particular time period by the number of live births over the same period.', 'role': 'assistant'}]