Which signs are not associated with oral features of Rubella?

The indication that "None of the above" is correct suggests that all the signs listed are indeed associated with oral features of Rubella, or at the very least, they are not typically absent in the context of the disease.

In this case, a thorough understanding of each feature is essential. Fordyce's spots are small, painless, pale bumps that can appear on the lips and are a natural occurrence rather than a feature of any specific disease. Koplik spots are often used as a clinical sign for measles, not Rubella, so this could create some confusion; however, their exclusion from Rubella is not definitive. Geographic tongue, which entails a benign condition characterized by irregular patches on the tongue surface, does not have a direct relationship with Rubella either.

Given this context, the answer "None of the above" implies that none of the physical signs presented is specifically tied to oral manifestations of Rubella. It is acknowledged that while Fordyce's spots and geographic tongue may show up in a variety of individuals for unrelated reasons, they are not considered definitive signs of oral Rubella. Therefore, the selection of "None of the above" denotes that the options given do not explicitly or accurately represent the common manifestations associated with Rubella in