This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Pediatrics
[{'content': 'A 4-year-old male child presents with fever, anemia and azotemia after an episode of dysentery 9 days earlier. The commonest organism responsible for this condition is? \nSelect and explain. \nA. Meningococcus, B. E.coli, C. E. histolytica, D. Staphylococcus', 'role': 'user'}, {'content': "Answer: B \nExplanation: b. E. coli(Ref: Nelson's 20/e p 2540-2543, Ghai 8/e p 487-491)The given condition is most likely HUS for which the most common organism is E. coli, among the given options", 'role': 'assistant'}]