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: Microbiology
Infection with which of the following agents is particularly dangerous for anemic patients - 
Select and explain. 
A. Adenovirus, B. Cytomegalovirus, C. Herpes simplex virus, D. Parvovirus
D: Parvovirus
Answer: D: Parvovirus 
Explanation: None