This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Which of the following is a ratio- \nSelect and explain. \nA. IMR, B. MMR, C. Prevalence, D. Incidence', 'role': 'user'}, {'content': "Answer: B \nExplanation: park's textbook of preventive and social medicine 23rd edition. *rate comprises numerator ,denominator ,time specification and multiplier.the numerator is a component of denominator in calculating rate but not in the ratio.ratio expresses a relation in size between two random quantities . *IMR, prevalence and incidence are rates . *MMR- no of female death due to complication of pregnancy ,child bih or within 42 days of delivery from puerperal causes in an area during a given year/ total on of live bih in the same area and year multiplier by 1000.", 'role': 'assistant'}]