**Core Concept**
The given ratio, number of live births per 1,000 women of reproductive age (15-45 years), is a demographic indicator used to measure the fertility rate of a population. This ratio is a key parameter in assessing the reproductive health and fertility trends of a population.

**Why the Correct Answer is Right**
The total fertility rate (TFR) is calculated by multiplying the number of live births per 1,000 women of reproductive age by 1,000. This gives the average number of children a woman would have in her lifetime based on the current age-specific fertility rates. The TFR is a sensitive indicator of changes in fertility patterns and is essential for population projections and family planning programs.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the number of live births per 1,000 women of reproductive age does not directly indicate the crude birth rate (CBR). The CBR is calculated by dividing the total number of live births by the total population.
* **Option B:** This option is incorrect because the number of live births per 1,000 women of reproductive age is not a direct measure of the general fertility rate (GFR). The GFR is calculated by dividing the number of live births by the number of women of reproductive age.

**Clinical Pearl / High-Yield Fact**
Remember, the total fertility rate (TFR) is a key indicator of fertility trends and is essential for population projections. It is calculated by multiplying the number of live births per 1,000 women of reproductive age by 1,000.

**Correct Answer:** C. The number of live births per 1,000 women of reproductive age (15-45 years) is a measure of the total fertility rate (TFR).