Final answer:
Measles is an acute viral infection with symptoms such as high fever, sore throat, and a macular rash. It is characterized by the presence of Koplik spots in the mouth. If left untreated, measles can lead to SSPE.
Step-by-step explanation:
Measles is the correct answer. Measles is an acute viral infection that can cause several symptoms, including a high fever, conjunctivitis, sore throat, and a macular rash that starts on the face and spreads to the extremities. One of the hallmark signs of measles is the presence of Koplik spots, which are white spots that form inside the mouth. If not properly treated, measles can lead to serious complications, including a rare condition called Subacute Sclerosing Panencephalitis (SSPE) which can occur years after the initial infection.