This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary tract, Subject name: Pathology
[{'content': 'Hemolytic uremic syndrome \nSelect and explain. \nA. Most commonly caused by verocytogenic E.Coli, B. Causes mild to severe coombs positive hemolytic anemia, C. Recurrences rare, D. Transient thrombocytopenia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hemolytic uremic syndrome: Caused by deficiencies of complement regulatory proteins or agents that damage endothelial cells, such as a Shiga-like toxin elaborated by E. coli strain O157:H7. The endothelial injury initiates platelet activation, platelet aggregation, and microvascular thrombosis. Ref: ROBBINS BASIC PATHOLOGY 10th ed Pg no: 491', 'role': 'assistant'}]