**Question:** False statement about dermatophytes is

A. Dermatophytes are not responsible for superficial mycoses
B. Dermatophytes primarily infect mucosal surfaces
C. Dermatophytes are harmless and do not cause disease
D. Dermatophytes are limited to tropical climates

**Core Concept:** Dermatophytes are a group of fungi that predominantly cause superficial infections in humans and animals, known as dermatophytosis or tinea. They primarily infect keratinized tissues such as skin, hair, and nails.

**Why the Correct Answer is Right:**

Correct Answer: **D. Dermatophytes are limited to tropical climates**

Dermatophytes are not limited to tropical climates, but they do thrive in warmer environments with high humidity. They are found globally, but the prevalence can vary depending on geographical location and population factors.

**Why Each Wrong Option is Incorrect:**

A. **Dermatophytes are not responsible for superficial mycoses:** This statement is incorrect as dermatophytes are the primary causative agents of superficial mycoses, specifically dermatophytosis or tinea.

B. **Dermatophytes primarily infect mucosal surfaces:** Dermatophytes primarily infect keratinized tissues such as skin, hair, and nails, not mucosal surfaces.

C. **Dermatophytes are harmless and do not cause disease:** Dermatophytes can cause significant morbidity, particularly in immunocompromised individuals and in widespread infections.

**Clinical Pearl:**

Understanding the correct distribution and target tissues of dermatophytes is crucial to diagnose and treat dermatophytosis accurately. Dermatophytes are not limited to tropical climates and can affect individuals globally. Superficial mycoses are primarily caused by dermatophytes, which primarily infect keratinized tissues like skin, hair, and nails, not mucosal surfaces.