**Question:** Most common cause of otomycosis:

A. Aspergillus species
B. Candida species
C. Trichophyton species
D. Non-dermatophyte molds

**Correct Answer:** B. Candida species

**Core Concept:** Otomycosis is a fungal infection of the ear canal, which is caused by various fungi. The most common cause is candida species, particularly Candida albicans, which are saprophytic fungi that colonize the human skin and mucous membranes.

**Why the Correct Answer is Right:** Candida species, including C. albicans, are opportunistic pathogens that can cause infections in immunocompromised individuals or in those with an altered immune system. Otomycosis is a result of the overgrowth of these fungi in the ear canal, leading to inflammation, pain, and discharge.

**Why Each Wrong Option is Incorrect:**

A. Aspergillus species: These are saprophytic fungi that are less likely to cause otomycosis compared to Candida species.

B. Trichophyton species: These are dermatophytes, which primarily affect the skin and hair, making them less likely to cause otomycosis.

C. Non-dermatophyte molds: Similar to Trichophyton species, non-dermatophyte molds are less likely to cause otomycosis compared to Candida species.

**Clinical Pearl:** Candida species are part of the normal flora in the oral and genitourinary tracts, making individuals with altered immunity more prone to develop otomycosis. Regularly cleaning the ear canal and using antifungal ear drops can help prevent this infection.