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: Medicine
Life-threatening intravascular hemolysis, due to a toxin with lecithinase activity, occurs with sepsis due to: 
Select and explain. 
A. Pseudomonas, B. Babesia, C. Parvovirus B 19, D. Clostridium perfringens
D: Clostridium perfringens
Answer: D: Clostridium perfringens 
Explanation: Life-threatening intravascular hemolysis, due to a toxin with lecithinase activity, occurs with Clostridium perfringens sepsis. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 881