<prompt> Which of the following is a ratio-IMRMMRPrevalenceIncidence  <response>: parks 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. 