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
Which organism causes hemolytic uremic syndrome 
Select and explain. 
A. Neisseria, B. Salmonella, C. Pseudomonas, D. E. Coli
D: E. Coli
Answer: D: E. Coli 
Explanation: Hemolytic uremic syndrome (HUS) is a type 3 hypersensitivity reaction associated with small vessel vasculitis.
• Organisms causing HUS is E.Coli (particularly EHEC) and shigella dysenteriae.