**Core Concept**
Iodophores are compounds that enhance the solubility and stability of iodine in aqueous solutions, making them useful in various medical and industrial applications. They work by forming a complex with iodine, thereby allowing it to dissolve in water. Iodophores are widely used in antiseptic solutions, disinfectants, and contrast agents for medical imaging.

**Why the Correct Answer is Right**
The correct answer is a mixture of a quaternary ammonium compound and iodine. The quaternary ammonium compound, typically benzalkonium chloride, forms a stable complex with iodine, allowing it to dissolve in water. This complex is known as an iodophor. The quaternary ammonium compound helps to stabilize the iodine and prevent it from oxidizing, thereby maintaining its antiseptic properties.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because iodophores do not contain a mixture of iodine and a non-ionic surfactant. While non-ionic surfactants can enhance the solubility of iodine, they are not a component of iodophores.
**Option B:** This is incorrect because iodophores do not contain a mixture of iodine and a cationic surfactant. Cationic surfactants can interact with negatively charged surfaces, but they are not typically used in iodophores.

**Clinical Pearl / High-Yield Fact**
Iodophores are widely used in medical settings due to their ability to provide a broad spectrum of antimicrobial activity while minimizing the risk of skin irritation and allergic reactions. They are commonly used in disinfectants, antiseptic solutions, and contrast agents for medical imaging.

**Correct Answer:** C.