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
Best index for measuring contraceptive efficacy is - 
Select and explain. 
A. Pearl index, B. Life-table analysis, C. Chandler's index, D. Quetlet index
B: Life-table analysis
Answer: B: Life-table analysis 
Explanation: Ans. is 'b' i.e., Life-table analysis o For contraceptive efficacy two method are used (i) Pearl index ii) Life table analysis (Better measure than Pearl index)