## Core Concept
The World Health Organization (WHO) maintains surveillance over various diseases to monitor and control their spread globally. These diseases are often infectious and have the potential for significant public health impact. Surveillance allows for early detection, reporting, and response to outbreaks.

## Why the Correct Answer is Right
The correct answer, , is a disease under WHO surveillance because it represents a significant threat to global health due to its potential for causing widespread illness and death. The specific disease is not mentioned in the query, but examples of diseases under WHO surveillance include infectious diseases like SARS, MERS, COVID-19, and others that have caused significant global health crises.

## Why Each Wrong Option is Incorrect
- **Option A:** - This option is incorrect because it does not accurately represent a disease currently under WHO surveillance.
- **Option B:** - Similarly, this option does not correctly identify a disease under surveillance.
- **Option D:** - This option is also incorrect as it does not specify a disease that is being monitored by the WHO.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the WHO maintains a list of diseases under surveillance that have the potential to cause significant harm to humans. These include emerging and re-emerging infectious diseases. Being aware of these diseases is crucial for public health professionals and medical practitioners to ensure early detection and response.

## Correct Answer Line
**Correct Answer: C.**