## Core Concept
Quarantinable diseases are conditions that require strict isolation and control measures to prevent their spread, often due to their high contagion rate and potential for causing significant public health threats. These diseases typically have specific public health regulations and international health regulations (IHR) in place for their control. The primary goal of quarantine is to prevent the spread of infectious diseases by restricting the movement of individuals who may have been exposed.

## Why the Correct Answer is Right
The correct answer, **Yellow Fever**, is a viral disease transmitted by infected mosquitoes. It is a significant public health concern in parts of Africa and South America. Due to its potential for outbreaks and the severity of the disease, which can be fatal, yellow fever is subject to international health regulations. Quarantine and vaccination are critical control measures.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is blank and does not provide a disease for evaluation.
- **Option B:** This option is also blank and does not provide a disease for evaluation.
- **Option C:** Similarly, this option does not provide a disease and cannot be evaluated.
- **Option D:** This option is blank as well.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **Yellow Fever** is a quarantinable disease that requires proof of vaccination for travelers entering or leaving endemic areas. This disease is a classic example of why strict control measures, including quarantine and vaccination, are essential to prevent its spread.

## Correct Answer: D. Yellow Fever