Which one of the following is the geophilic dermatophyte?
**Core Concept**
The question is testing the student's knowledge of dermatophytes, which are a group of fungi that infect the skin, hair, and nails. Geophilic dermatophytes are a specific group that inhabit the soil and can infect humans through contact.
**Why the Correct Answer is Right**
The correct answer is **C. Trichophyton rubrum** is not geophilic. The geophilic dermatophyte is **C. Microsporum canis** is not geophilic, the correct answer is **C. Trichophyton gypseum** is geophilic. **Trichophyton gypseum** is a geophilic dermatophyte that grows in the soil and can infect humans through contact with contaminated soil. It is a common cause of tinea corporis and tinea pedis.
**Why Each Wrong Option is Incorrect**
**Option A:** **Trichophyton rubrum** is a common dermatophyte that infects the skin, hair, and nails, but it is not geophilic.
**Option B:** **Microsporum canis** is a common dermatophyte that infects the skin and hair, but it is not geophilic; it primarily infects cats and dogs.
**Option D:** **Epidermophyton floccosum** is a dermatophyte that infects the skin and nails, but it is not geophilic.
**Clinical Pearl / High-Yield Fact**
Geophilic dermatophytes can be a source of infection for humans, especially in areas where soil contamination is high. It's essential to practice good hygiene and avoid contact with contaminated soil to prevent dermatophyte infections.
**Correct Answer: C. Trichophyton gypseum**