Which of the following is an example of a fungal disease?

Ringworm is classified as a fungal disease because it is caused by dermatophytes, a type of fungus that infects the skin, hair, and nails. The term "ringworm" refers to the characteristic circular, ring-like rash that appears on the skin as a result of the infection. It’s important to understand that the infection is not caused by an actual worm but rather by this fungal invasion, making it distinctly different from conditions caused by bacteria or viruses.

In contrast, rashes may arise from a variety of causes, including allergic reactions, irritants, or infections of different origins, but they do not specifically indicate a fungal infection. Asthma is a chronic respiratory condition and does not relate to fungal infections at all, while psoriasis is an autoimmune skin disorder characterized by the rapid growth of skin cells, leading to scaling and inflammation. Each of these alternatives involves different biological mechanisms and does not represent a fungal disease, highlighting why ringworm is the correct example in this context.