Which viral diseases are known collectively as exanthematous viral diseases?

The group of viral diseases known as exanthematous viral diseases includes measles, rubella, and mumps because these illnesses are characterized by their distinctive rashes (exanthems) that often accompany the viral infections. Each of these diseases presents with an eruption of skin lesions as part of their clinical manifestation.

Measles is known for its red, blotchy rash that typically starts on the face and spreads downwards. Rubella, also called German measles, causes a mild rash that appears after other symptoms, while mumps is primarily characterized by swelling of the salivary glands rather than a rash, but it is still included in this category due to its viral nature and association with exanthematous disease.

This classification helps in understanding the diseases' similarities in transmission and vaccination protocols since they are often grouped together in immunization schedules. Other choices, while involving infectious diseases, do not fit the criteria of exanthematous diseases characterized by specific rashes.