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 occurs with sepsis due to which organism? 
Select and explain. 
A. Clostridium perfringens, B. Mycoplasma pneumonia, C. Pseudomona, D. Klebsiella
A: Clostridium perfringens
Answer: A: Clostridium perfringens 
Explanation: Life threatening intravascular hemolysis due to a toxin with lecithinase activity is seen in Clostridium perfringens sepsis. Ref: Harrison's principles of internal medicine, 18th edition, Page 881