All of the following are caused by dermatophytes except:
**Core Concept**
Dermatophytes are a group of fungi that infect the skin, hair, and nails of humans and animals. They cause a range of superficial fungal infections, including ringworm, athlete's foot, and onychomycosis.
**Why the Correct Answer is Right**
Dermatophytes infect the keratin-containing tissues of the skin, hair, and nails. They secrete enzymes that break down keratin, leading to tissue damage and clinical manifestations. The most common dermatophytes responsible for human infections are Trichophyton, Microsporum, and Epidermophyton species.
**Why Each Wrong Option is Incorrect**
**Option A:** This option may be a correct answer, but it's not specified. If you must choose, we can assume that A. Tinea capitis (ringworm of the scalp) is a common condition caused by dermatophytes, so this option might be correct, but it's not the best choice without more information.
**Option B:** This option is likely incorrect. Histoplasmosis is a fungal infection caused by Histoplasma capsulatum, not dermatophytes.
**Option C:** This option is likely incorrect. Coccidioidomycosis is a fungal infection caused by Coccidioides species, not dermatophytes.
**Option D:** This option is likely incorrect. Aspergillosis is a fungal infection caused by Aspergillus species, not dermatophytes.
**Clinical Pearl / High-Yield Fact**
Dermatophytes can be differentiated from other fungi by their ability to infect keratin-containing tissues. This characteristic is essential for diagnosing and treating superficial fungal infections.
**Correct Answer:** B. Histoplasmosis