This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Elevated IgG and IgM antibody titers to parvovirus suggest a diagnosis of 
Select and explain. 
A. Fifth disease, B. Susceptibility to chickenpox, C. Possible subacute sclerosing panencephalitis (SSPE), D. Possible hepatitis B infection
A: Fifth disease
Answer: A: Fifth disease 
Explanation: Fifth disease is a viral exanthem commonly seen in children 8 to 12 years old. Children are ill for a few days but recover without incident. Unfortunately, if a pregnant female acquires the disease in the first trimester of pregnancy, the fetus is at risk. The causative agent is thought to be a parvovirus (parvovirus B 19).