Which one of the following conditions is linked specifically to acquired immune deficiency syndrome (AIDS)?

Kaposi's sarcoma is specifically linked to acquired immune deficiency syndrome (AIDS) due to its association with human immunodeficiency virus (HIV). This type of cancer is characterized by the abnormal growth of blood vessels and is particularly prevalent in individuals with compromised immune systems, such as those living with AIDS. It is often identified by lesions that can appear on the skin, as well as within mucosal surfaces.

The other conditions mentioned may occur in individuals with compromised immune systems but are not exclusive to AIDS. Oral candidiasis, for example, is a fungal infection that can affect anyone with a weakened immune system, not just those with AIDS. Leukoplakia and squamous cell carcinoma may be linked to various factors, including tobacco use and chronic irritation, and while they can occur more frequently in immunocompromised individuals, they are not specifically diagnosed as part of AIDS-related conditions. Therefore, Kaposi's sarcoma stands out as a condition distinctly associated with AIDS.