This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Waterhouse-Friderichsen syndrome is caused by 
Select and explain. 
A. Neisseria, B. Chlamydia, C. Hemophilus influenza type b, D. Listeria
A: Neisseria
Answer: A: Neisseria 
Explanation: Meningococcemia sometimes occurs without meningitis and may progress to fulminant DIC and shock with bilateral hemorrhagic destruction of the adrenal glands (Waterhouse-Friderichsen syndrome).Ref: Sherris microbiology; 6th edition; Page no: 540