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: Unknown
Which of following viruses causes Hemolysis of Red blood cells ? 
Select and explain. 
A. Rubella, B. Human parvo virus B19, C. Measles, D. Dengue virus
B: Human parvo virus B19
Answer: B: Human parvo virus B19 
Explanation: Ans. (b) Human parvovirus B19Ref: Robbin's pathology 9th ed. /635-36*Human parvovirus B19 is responsible for the aplastic crisis that can be life-threatening in cases of sickle cell anemia and hereditary spherocytosis. It is treated with blood transfusion.*Remember: Parvovirus infection in pregnant women is associated with Hydrops fetalis due to severe fetal anemia, sometimes leading to miscarriage or stillbirth. The risk of fetal loss is about 10% if infection occurs before pregnancy week 20 (especially between weeks 14 and 20), but minimal after then.