**Core Concept**
Dermatophytoses, also known as ringworm, is a fungal infection of the skin caused by a specific group of fungi known as dermatophytes. These fungi obtain their nutrients by breaking down keratin, a protein found in skin, hair, and nails.

**Why the Correct Answer is Right**
Dermatophytes are a type of fungi that belong to the phylum Ascomycota. They have a unique ability to infect the dead or living cells of the skin, hair, and nails, and to break down keratin using enzymes such as keratinase and serine proteases. The most common dermatophytes that cause infections in humans are Trichophyton, Microsporum, and Epidermophyton.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because dermatophytoses is not caused by bacteria, such as Staphylococcus aureus, which can cause other types of skin infections.
**Option B:** This option is incorrect because yeasts, such as Candida albicans, can cause other types of fungal infections, but they are not the primary cause of dermatophytoses.
**Option C:** This option is incorrect because viruses, such as herpes simplex, can cause other types of skin infections, but they are not associated with dermatophytoses.

**Clinical Pearl / High-Yield Fact**
Dermatophytes can be spread through direct contact with an infected person, contaminated fomites, or by animals that carry the infection. It's essential to practice good hygiene and avoid sharing personal items to prevent the spread of dermatophytoses.

**Correct Answer: D. Trichophyton, Microsporum, and Epidermophyton. Dermatophytes.**