To achieve Net reproduction rate (NRR) of 1, couple protection rate should be –
**Core Concept**
The Net Reproduction Rate (NRR) is a demographic measure that indicates the average number of daughters a woman would have in her lifetime, assuming the current age-specific fertility and mortality rates remain constant. A NRR of 1 is considered the replacement level, where the population remains stable over time. Couple Protection Rate (CPR) is the percentage of couples of reproductive age using some form of modern contraceptive method.
**Why the Correct Answer is Right**
To achieve a NRR of 1, the CPR needs to be high enough to prevent a significant number of unintended pregnancies. A CPR of 60% is generally considered the threshold to stabilize the population, as it significantly reduces the number of births and allows the population to replace itself. This is because a substantial proportion of couples are using effective contraception, leading to a decrease in the total fertility rate (TFR) and, consequently, the NRR. The World Health Organization (WHO) recommends a CPR of at least 60% to achieve a NRR of 1.
**Why Each Wrong Option is Incorrect**
**Option A:** A CPR of 40% is too low to achieve a NRR of 1, as it would still result in a significant number of unintended pregnancies and births, leading to population growth.
**Option C:** A CPR of 80% is higher than necessary to achieve a NRR of 1, but it is still a reasonable target for population stabilization and would likely lead to a decrease in the TFR and NRR.
**Clinical Pearl / High-Yield Fact**
A CPR of 60% is often considered the minimum threshold to achieve a NRR of 1, as it significantly reduces the number of unintended pregnancies and allows the population to replace itself over time.
**Correct Answer:** C.