This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
All of the following statements about parvovirus B - 9 are true except: 
Select and explain. 
A. DNA virus, B. Crosses placenta in only < 10% of cases, C. Can cause severe anemia, D. Can cause aplastic crisis
B: Crosses placenta in only < 10% of cases
Answer: B: Crosses placenta in only < 10% of cases 
Explanation: Ans. is 'b' i.e., Crosses placenta in only < 10% of cases (Ref: Jawetz, 24th/e, p. 414, 417)* Maternal infection with B19 virus may pose a serious risk to the fetus, resulting in hydrops fetalis and fetal death due to severe anemia. Fetal loss occurs in fewer than 10% of primary maternal infections and death occurs most commonly before the 20th week of pregnancy. Although there is frequent intrauterine transmission of human parvovirus (with estimates of vertical transmission rates of 30% or higher).