Okay, let's tackle this question about the proportional mortality rate. First, I need to recall what each of these terms means. The question is asking for the definition of the proportional mortality rate. Let me start by breaking down the term.

Proportional mortality rate (PMR) is a measure used in epidemiology. From what I remember, it's the proportion of deaths in a specific population that are due to a particular cause. So, it's not the total number of deaths, but the percentage or proportion of all deaths in a group that are attributed to a certain disease or condition. For example, if there are 100 deaths in a population, and 20 are due to heart disease, the PMR for heart disease would be 20%.

Now, the options here aren't provided, but I can think of similar measures and how they differ. Let's consider other rates like the crude death rate, case fatality rate, or the cause-specific mortality rate. The crude death rate is total deaths per population, regardless of cause. The case fatality rate is the proportion of deaths among diagnosed cases of a disease. The cause-specific mortality rate is the number of deaths from a specific cause divided by the total population.

So, the proportional mortality rate specifically is about the proportion of all deaths that are due to a specific cause. This is different from cause-specific rates, which are per population. PMR is useful for understanding the relative impact of different diseases in a population. It's often used in public health to prioritize health issues.

Now, if the options were something like:

A. Number of deaths from a specific cause divided by the total number of deaths in a population during a time period.

B. Number of deaths from a specific cause divided by the total population at risk.

C. Number of deaths from a specific cause divided by the number of cases of the disease.

D. Total number of deaths in a population divided by the total population.

Then the correct answer would be A. Because PMR is the proportion of deaths due to a specific cause out of all deaths. Option B would be the cause-specific mortality rate. Option C is the case fatality rate. Option D is the crude death rate.

I need to make sure that I'm not confusing these terms. The key here is that PMR is about the proportion of all deaths, not the total population or the number of cases. So the correct answer is the one that defines PMR as deaths from a specific cause divided by total deaths. That's the core concept here.

**Core Concept**
Proportional mortality rate (PMR) measures the proportion of all deaths in a population attributable to a specific cause. It is calculated as **(Number of deaths from a specific cause / Total number of deaths in the population) × 100**. This metric highlights the relative contribution of a disease to overall mortality.

**Why the Correct Answer is Right**
The proportional mortality rate focuses on the *distribution of causes of death* rather than absolute numbers. For example, if 500 out of 2,000 total deaths in a year are due to heart disease, the PMR for heart disease is 25%. This helps identify leading causes of death in a population, guiding public health priorities. It is distinct from cause-specific mortality rate (per 100,000 population) or case fat

✓ Correct Answer: C. Number of death due to particular a cause