Which of the following is the indicator of prevalence of contraceptive practice in a community?

Correct option is A

Couple Protection Rate (CPR) is the most widely used indicator for measuring the prevalence of contraceptive use in a community. It represents the percentage of eligible couples (usually women aged 15–49) who are effectively protected against childbirth through any contraceptive method. It reflects current usage patterns and is key to evaluating the success of family planning programs.
Explanation for each option: (a) couple protection rate (CPR): Correct. CPR directly indicates how many couples are using contraceptive methods, and is the standard measure of prevalence in public health. (b) effective couple protection rate (ECPR): Incorrect. ECPR includes only modern and effective methods, but it's a refinement — not the standard indicator of overall prevalence. (c) net reproduction rate (NRR): Incorrect. NRR reflects population replacement levels, not contraceptive prevalence. (d) gross reproduction rate (GRR): Incorrect. GRR is the average number of daughters born to a woman and doesn't reflect contraception usage. (e) question not attempted: Not applicable.