This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
A child has fever with redness of cheek. The causative organism fohis condition is: 
Select and explain. 
A. Herpes virus, B. Parvovirus B-19, C. Adenovirus, D. Rubella
B: Parvovirus B-19
Answer: B: Parvovirus B-19 
Explanation: Ans. (B) Parvovirus B-19Exanthema infectiosum:The characteristic rash first appears as erythematous flushing on the face in a slapped cheek appearance (red cheek).The most common manifestation of parvovirus B19 is erythema infectiosum, also known as fifth disease, which is a benign, self-limited exanthematous illness of childhood.It was the 5th in a classification scheme of common childhood exanthems.The preceding 4 exanthems were measles, scarlet fever, rubella, and Filatov-Dukes disease (an atypical scarlet fever), with roseola infantum as the "sixth disease