Final answer:
Scarlet Fever is caused by Group A Streptococcus (Streptococcus pyogenes), which produces an erythrogenic toxin. This toxin leads to the characteristic symptoms of scarlet fever, such as a fine red rash on the skin and strawberry tongue.
Step-by-step explanation:
The agent responsible for Scarlet Fever is Group A Streptococcus (Streptococcus pyogenes). Scarlet Fever is a bacterial infection caused by certain strains of group A streptococci that produce erythrogenic toxin. This toxin attacks the plasma membranes of capillary endothelial cells and leads to the characteristic symptoms of scarlet fever, such as a fine red rash on the skin and strawberry tongue.