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
Hemolytic uremic syndrome 
Select and explain. 
A. Most commonly caused by verocytogenic E.Coli, B. Causes mild to severe coombs positive hemolytic anemia, C. Recurrences rare, D. Transient thrombocytopenia
B: Causes mild to severe coombs positive hemolytic anemia
Answer: B: Causes mild to severe coombs positive hemolytic anemia 
Explanation: 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