Which condition is characterized by a fungal infection of the nails?

• A. Onychomycosis
• B. Psoriasis
• C. Onychogryphosis
• D. Onycholysis

Answer: (A)

Onychomycosis is the correct answer as it specifically refers to a fungal infection of the nails. This condition can affect either fingernails or toenails and is often caused by various types of fungi, including dermatophytes, yeasts, and molds. The infection typically leads to symptoms such as thickened, discolored, and brittle nails, which may gradually separate from the nail bed.

Other conditions mentioned do not pertain to fungal infections. Psoriasis is a chronic autoimmune condition that can affect the skin and nails, leading to pitting, discoloration, and separation from the nail bed, but it is not caused by a fungal infection. Onychogryphosis refers to an abnormal thickening and curvature of the nail, often associated with neglect or underlying medical conditions, rather than a fungal cause. Onycholysis involves the separation of the nail from its bed but can arise from various factors, including trauma or allergic reactions, rather than being a direct result of a fungal infection.