**Core Concept**
Proportional mortality rate (PMR) is a statistical measure used to express the proportion of deaths due to a specific cause within a population. It is calculated by dividing the number of deaths due to a particular cause by the total number of deaths, and then multiplying by 100 to obtain a percentage.

**Why the Correct Answer is Right**
The PMR is useful for comparing the importance of different causes of death within a population. By calculating the PMR, healthcare professionals can identify the leading causes of death and allocate resources accordingly. For instance, if a population has a high PMR for cardiovascular disease, it may indicate the need for increased prevention and treatment efforts for this condition.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the proportional mortality rate. The correct formula for PMR involves dividing the number of deaths due to a specific cause by the total number of deaths.

**Option B:** This option is incorrect because it is not a valid measure of mortality. While it may be related to mortality, it does not provide information about the proportion of deaths due to a specific cause.

**Option C:** This option is incorrect because it is not the correct formula for proportional mortality rate. The correct formula involves dividing the number of deaths due to a specific cause by the total number of deaths.

**Clinical Pearl / High-Yield Fact**
The proportional mortality rate is a useful tool for public health officials and healthcare professionals to identify the leading causes of death within a population and allocate resources accordingly. By understanding the PMR, healthcare providers can make informed decisions about prevention and treatment efforts.

**Correct Answer:**
Proportional Mortality Rate (PMR) is calculated as (Number of deaths due to a specific cause ÷ Total number of deaths) × 100.