Which of the following is a sign of nail fungus?

Separation of the nail from the nail bed is a significant indicator of nail fungus, also known as onychomycosis. This condition occurs when fungal infections cause a breakdown of the healthy tissue that holds the nail to the underlying nail bed, resulting in the nail lifting away. This separation can lead to discoloration, changes in texture, and potential pain, further signaling an infection.

Strong, pleasant odor does not typically correlate with nail fungus. Instead, fungal infections often produce a foul smell due to decaying tissue.

Ridges along the nail can be a sign of various health conditions or can result from trauma, but they are not specifically indicative of fungal infections.

Consistent shine on the surface of the nail usually suggests healthy nail growth. Fungal infections often lead to dullness or changes in nail surface texture rather than a shine. Thus, separation of the nail from the nail bed is a clear and direct sign of nail fungus.