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
[{'content': 'Life threatening intravascular hemolysis occurs with sepsis due to which organism? \nSelect and explain. \nA. Clostridium perfringens, B. Mycoplasma pneumonia, C. Pseudomona, D. Klebsiella', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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", 'role': 'assistant'}]