The constant presence of disease within a geographical area is known as -

Correct option is A

Sol. An endemic disease is one that is consistently present in a particular geographic area or population. Examples include malaria in tropical regions and tuberculosis in certain countries. Endemic diseases have a predictable pattern and occur at a steady rate over time.
Explanation of Each Option:
· Endemic: Correct answer; refers to a disease that is always present in a specific area or population.
· Epidemic: Incorrect; a sudden increase in disease cases within a region, such as a flu outbreak.
· Pandemic: Incorrect; a worldwide outbreak of a disease, like COVID-19.
· Isolation: Incorrect; a public health measure used to prevent disease spread, not a disease classification.