**Core Concept**
The question pertains to hospital infection control and disinfection practices. The underlying principle being tested involves the use of a specific method to sterilize wards, which is crucial for preventing the spread of hospital-acquired infections. This involves the use of a chemical agent that is effective against a broad spectrum of microorganisms.

**Why the Correct Answer is Right**
The correct method for sterilizing wards in a hospital typically involves the use of ultraviolet (UV) light. UV light is a physical agent that works by damaging the DNA of microorganisms, preventing them from reproducing and ultimately leading to their death. This method is effective against a broad spectrum of microorganisms, including bacteria, viruses, and fungi. The use of UV light for disinfection is particularly useful in areas where chemical disinfectants may not be effective or are not feasible to use.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a recognized method for sterilizing wards in a hospital setting.
**Option B:** This option is incorrect because it is not a commonly used method for sterilizing wards in a hospital setting.
**Option C:** This option is incorrect because it is not a recognized method for sterilizing wards in a hospital setting.

**Clinical Pearl / High-Yield Fact**
It is essential for healthcare workers to follow proper protocols for disinfection and sterilization to prevent the spread of hospital-acquired infections. This includes using personal protective equipment, following proper hand hygiene practices, and using effective disinfection methods such as UV light.

**Correct Answer: C. UV light disinfection.**