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
Acute intravascular hemolysis can be caused by infection due to all of the following organisms except- 
Select and explain. 
A. Clostridium tetani, B. Bartonella bacilliformis, C. Plasmodium falciparum, D. Babesia microti
A: Clostridium tetani
Answer: A: Clostridium tetani 
Explanation: Organisms that parasitize RBCs can directly lyse them and can cause intravascular hemolysis.
Intracellular parasites; reside within RBCs: Plasmodium spp., Babesia spp., Bartonella baciliformis
Clostridium tetani is not intracellular parasite; it can cause hemolysis indirectly by production of tetanolysin toxin, but it not intravascular hemolysis.