## Core Concept
The question tests the understanding of infection control measures, specifically in the context of a Methicillin-resistant Staphylococcus aureus (MRSA) outbreak. MRSA is a type of bacteria that is resistant to many antibiotics, making it a significant concern in hospitals. Effective control measures are crucial to prevent its spread.

## Why the Correct Answer is Right
Implementing contact precautions is a critical step in controlling the spread of MRSA. This involves wearing gloves and gowns when interacting with patients who have MRSA or are colonized with it. This measure directly targets the mode of transmission of MRSA, which can spread through direct or indirect contact with an infected or colonized patient. By donning appropriate personal protective equipment (PPE), healthcare workers can significantly reduce the risk of transmitting MRSA to other patients or acquiring it themselves.

## Why Each Wrong Option is Incorrect
- **Option A:** While hand hygiene is an essential component of infection control, it is a general measure and does not specifically address the need for immediate action in an MRSA outbreak situation. Hand hygiene is crucial but must be complemented with other specific measures like contact precautions for MRSA.
- **Option B:** Isolating all patients with any type of infection might be overly broad and not practical. Specific isolation procedures like contact precautions are tailored to the type of pathogen and are more effective.
- **Option C:** Administering antibiotics prophylactically to all patients is not a standard approach to controlling MRSA outbreaks. This could contribute to antibiotic resistance and is not a recommended strategy for preventing the spread of MRSA.

## Clinical Pearl / High-Yield Fact
A key point to remember is that in the event of an MRSA outbreak, immediate implementation of contact precautions for infected or colonized patients is critical. This includes the use of gloves and gowns for all interactions that have the potential for skin-to-skin contact or contact with the patient's environment. This strategy, combined with enhanced hand hygiene and environmental cleaning, forms the cornerstone of MRSA outbreak control.

## Correct Answer Line
**Correct Answer: D. Implement contact precautions.**