## Core Concept
The control of a cholera outbreak involves a multi-faceted approach focusing on safe water supply, sanitation, hygiene practices, and sometimes, specific medical interventions. Cholera, caused by Vibrio cholerae, is primarily spread through contaminated water and food.

## Why the Correct Answer is Right
The correct approach to controlling a cholera outbreak includes providing safe drinking water, improving sanitation facilities, promoting hygiene practices such as handwashing, and administering oral rehydration therapy (ORT) and, in some cases, antibiotics. Mass vaccination campaigns can also be considered. The correct answer, which is not specified here, likely involves an option that does not align with these evidence-based practices.

## Why Each Wrong Option is Incorrect
- **Option A:** Typically involves a measure like providing safe water, which is crucial.
- **Option B:** Could involve improving sanitation, another key measure.
- **Option C:** Might include vaccination or antibiotic treatment, both considered in outbreak control.
- **Option D:** The correct answer implies this option does not fit with recommended practices.

Without specific details on each option, we infer based on standard practices:
- Incorrect options likely include established methods like ensuring safe water (A), promoting hygiene and sanitation (B), and possibly vaccination or targeted antibiotic use (C).

## Clinical Pearl / High-Yield Fact
A critical aspect of cholera outbreak control is the swift implementation of ORT to prevent dehydration and reduce mortality. Additionally, health education on proper hygiene practices, such as handwashing with soap, is vital.

## Correct Answer: D. Chemoprophylaxis of contacts.