This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Viral Infections, Subject name: Pediatrics
Erythema infectiosum is seen in - 
Select and explain. 
A. Rubella, B. Fifth disease, C. Scarlet fever, D. Diphtheria
B: Fifth disease
Answer: B: Fifth disease 
Explanation: Ans. is 'b' Fifth disease Erythema infectiosum also known as fifth disease is caused by Parvo Virus (B-19)*.About Erythema infectiosum *Most common clinical manifestation of human parvovirus infection.Characteristics skin lesions appear in 3 stages:1st phase - Cheeks are erythematous giving appearance of slapped cheeks*.2nd phase - Itching erythematous maculopapular rash on extensor surface (Palms and soles spread)*.3rd phase - Rash begins to fade and disappears in about 2 weeks*.