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
[{'content': 'Waterhouse -Friderichsen syndrome is caused by which of the following organisms? \nSelect and explain. \nA. Streptococcus Pyogenes, B. Neisseria Meningitidis, C. Clostridium Perfringens, D. Staphylococcus Aureus', 'role': 'user'}, {'content': "Answer: B \nExplanation: Also called as fulminant meningococcemia. It is a fatal condition characterised with shock, DIC, multisystem failure. Ref: Ananthanarayan and Panicker's, 8th Edition, Page 225", 'role': 'assistant'}]