## **Core Concept**
The question tests the understanding of levels of prevention in public health. Levels of prevention are categorized into primary, secondary, tertiary, and primordial prevention. Each level targets a different stage in the development and progression of diseases.

## **Why the Correct Answer is Right**
Primary prevention aims at preventing the disease before it occurs. It includes measures to prevent the onset of disease. The installation and usage of sanitary latrines by the general public is a measure aimed at reducing the incidence of diseases by improving environmental hygiene and reducing the spread of pathogens. This action directly prevents the occurrence of many communicable diseases, making it a clear example of **primary prevention**.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Secondary prevention involves early detection and treatment of a disease to prevent its progression. While important, the installation of sanitary latrines does not directly involve screening or early detection of diseases.
- **Option B:** Tertiary prevention aims to reduce the impact of an ongoing illness or injury that has lasting effects. This includes measures to prevent complications and reduce disability. The installation of sanitary latrines does not fit into this category as it does not address disease management or rehabilitation.
- **Option D:** Primordial prevention seeks to prevent the emergence of risk factors in a population. While closely related to primary prevention, it specifically targets the avoidance of risk factors before they appear. Although installing sanitary latrines could be seen as reducing risk factors, the direct action described aligns more with preventing disease occurrence.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that primary prevention includes health promotion and specific protection, such as vaccination, use of condoms, and in this case, the use of sanitary latrines. These measures are crucial in public health for reducing the burden of disease.

## **Correct Answer:** .