## **Core Concept**
The question tests knowledge of disinfection protocols, specifically for handling potentially infectious bodily fluids like faeces and urine. Cresol is a type of phenolic disinfectant used for such purposes. The effectiveness of Cresol as a disinfectant depends on its concentration.

## **Why the Correct Answer is Right**
A 5% Cresol solution is commonly recommended for the disinfection of faeces and urine. This concentration is effective against a broad spectrum of pathogens, including bacteria, viruses, and fungi, making it suitable for handling potentially infectious materials. The use of Cresol for disinfection purposes leverages its antimicrobial properties, which disrupt cell membranes and denature proteins of microorganisms.

## **Why Each Wrong Option is Incorrect**
- **Option A:** A 2% Cresol solution might be effective for some disinfection tasks but could be less effective for the specific challenge of faeces and urine, which may contain a high load of pathogens.
- **Option B:** A 3% Cresol solution might not provide the necessary margin of safety or efficacy for the disinfection of highly contaminated materials like faeces and urine.
- **Option D:** A 10% Cresol solution, while more concentrated, is not typically required for routine disinfection of faeces and urine and could be unnecessarily harsh.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that for the disinfection of faeces and urine, a 5% Cresol solution is often recommended. This is a practical detail that can be crucial in infection control practices, especially in settings like hospitals or laboratories where such materials are frequently handled.

## **Correct Answer:** . 5% Cresol solution