**Core Concept**
Warthin-Finkeldey giant cells are a type of multinucleated giant cell seen in the context of viral infections, particularly in congenital rubella syndrome and measles. These cells are formed through the fusion of infected cells and are a hallmark of certain viral infections.

**Why the Correct Answer is Right**
Warthin-Finkeldey giant cells are characterized by their large size and multiple nuclei, which are often irregularly shaped and arranged. The formation of these cells is thought to be a result of the fusion of infected cells through the action of viral proteins, such as the measles virus nucleocapsid protein. This process allows the virus to spread more effectively within the host.

**Why Each Wrong Option is Incorrect**
**Option A:** Warthin-Finkeldey giant cells are not typically associated with autoimmune disorders, such as rheumatoid arthritis.
**Option B:** These cells are not a characteristic feature of bacterial infections, such as tuberculosis.
**Option C:** While giant cells can be seen in various types of viral infections, Warthin-Finkeldey giant cells are specifically associated with congenital rubella syndrome and measles.

**Clinical Pearl / High-Yield Fact**
Warthin-Finkeldey giant cells are an important diagnostic feature in the context of congenital rubella syndrome, which can have significant implications for fetal development and maternal health.

**Correct Answer: C. Measles**