## Core Concept
Irradiation is a method used for sterilization and involves the use of ionizing radiation to kill microorganisms. This technique is applied to various materials, including medical instruments, food, and pharmaceutical products. The effectiveness of irradiation sterilization depends on the type of radiation, dose, and the material being sterilized.

## Why the Correct Answer is Right
The correct answer, , implies that irradiation can be used to sterilize all the options provided except for one. Irradiation is commonly used for sterilizing medical devices, pharmaceuticals, and food products. However, certain materials are not suitable for irradiation due to potential damage from the radiation.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because irradiation can indeed sterilize certain types of medical equipment and supplies that are radiation-resistant.
- **Option B:** Similarly, this option is incorrect as irradiation is a viable method for sterilizing a wide range of materials, including some types of implants and surgical instruments.
- **Option D:** This option is also incorrect because many pharmaceutical products can be sterilized through irradiation, especially those that are heat-sensitive.

## Clinical Pearl / High-Yield Fact
A key point to remember is that irradiation is particularly useful for sterilizing heat-sensitive materials that cannot be sterilized by autoclaving. However, it's crucial to ensure that the material can withstand the radiation without degrading. For example, certain plastics and some types of sutures can be sterilized using irradiation.

## Correct Answer: C.