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 teh following statements about parvovirus B-19 are true, except- 
Select and explain. 
A. <10% spread by transplacental route, B. Respiratory route is the primary mode of transmission, C. It is a DNA virus, D. Affects erythroid progenitors
A: <10% spread by transplacental route
Answer: A: <10% spread by transplacental route 
Explanation: parvo virud is ssDNA virus.transmission is through respiratory route.genus is erythro virus REF:ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.554