This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: obstetrics,pediatrics and geriatrics, Subject name: Social & Preventive Medicine
Denominator in maternal moality ratio? 
Select and explain. 
A. Mid Year Population, B. Live bihs, C. Total bihs, D. Total numbebr of pregnancies
B: Live bihs
Answer: B: Live bihs 
Explanation: Maternal moality rate is total no.of female deaths due tobcomplications of pregnancy, childbih or within 42 days of delivery from puerperal causes in an area during a given year by total no.of live bihs in the same year and area.REF.PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE.Editon-21.Page no.-514