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
Waterhouse-Friderichsen syndrome is seen in ? 
Select and explain. 
A. Pneumococci, B. N. Meningitidis, C. Pseudomonas, D. Yersinia
B: N. Meningitidis
Answer: B: N. Meningitidis 
Explanation: Ans. is 'b' i.e., N. Meningitidis Fulminant meningococcemia (purpura fulminans or Waterhouse - Friderichsen syndrome) is the most rapidly lethal form of septic shock experienced by humans. It differs from most other form of septic shock by the prominance of hemorrhagic skin lesions (petechiae, purpura) and the consistent development of DIC.