**Core Concept**
Case fatality rate is a measure of the severity of a disease, representing the proportion of individuals with a particular disease who die from that disease. It is a crucial epidemiological parameter used to assess the mortality burden of a disease within a population.

**Why the Correct Answer is Right**
The case fatality rate is calculated by dividing the number of deaths due to a specific disease by the total number of cases of that disease, usually expressed as a percentage. This ratio provides valuable insights into the disease's virulence and the effectiveness of public health interventions. For instance, a high case fatality rate indicates a more severe disease, whereas a low rate suggests a milder disease or effective control measures.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is a measure of disease incidence, not mortality or case fatality. Incidence rate measures the number of new cases of a disease within a population over a specified period.
* **Option B:** This choice is incorrect because it is a measure of disease prevalence, which represents the total number of existing cases of a disease within a population at a given time, regardless of when the disease was first diagnosed. Prevalence does not account for disease severity or mortality.
* **Option C:** This option is incorrect because it is a measure of disease remission, which refers to the period of time during which a disease is no longer active or symptomatic. Remission rate does not provide information about disease mortality or severity.

**Clinical Pearl / High-Yield Fact**
When interpreting case fatality rates, it is essential to consider the context, including the study population, disease definition, and data collection methods. Additionally, case fatality rates can be influenced by factors such as access to healthcare, disease awareness, and the effectiveness of treatment protocols.

**Correct Answer: C. Case fatality rate is the proportion of individuals with a disease who die from that disease.**