To achieve a Net Reproduction Rate (NRR) of be 1 couple protection rate should be:
**Core Concept**
The Net Reproduction Rate (NRR) is a demographic measure that estimates the average number of daughters a newborn girl would have in her lifetime, assuming the current age-specific fertility and mortality rates. An NRR of 1 indicates that a population is replacing itself, while an NRR less than 1 indicates a declining population, and an NRR greater than 1 indicates a growing population. Couple Protection Rate (CPR) is a measure of the percentage of couples of reproductive age using some form of modern contraceptive method.
**Why the Correct Answer is Right**
Achieving an NRR of 1 requires a CPR of 60%. This is because a CPR of 60% means that 60% of couples are using some form of modern contraceptive method, resulting in a reduction in the number of children born per woman. This, in turn, leads to a stable population with an NRR of 1. The World Health Organization (WHO) and other international health organizations have set a goal of achieving an NRR of 1 as a key indicator of reproductive health and family planning success.
**Why Each Wrong Option is Incorrect**
**Option A:** A CPR of 40% would result in a higher NRR, as more couples are not using modern contraceptive methods, leading to an increase in the number of children born per woman.
**Option B:** A CPR of 80% would result in a lower NRR, as more couples are using modern contraceptive methods, leading to a decline in the number of children born per woman.
**Option C:** A CPR of 50% is not a correct answer, as the question specifically asks for the correct CPR to achieve an NRR of 1.
**Clinical Pearl / High-Yield Fact**
A CPR of 60% is a key indicator of reproductive health and family planning success, as it is associated with a stable population and reduced maternal and child mortality rates.
**Correct Answer: C. 60%.**