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: Medicine
[{'content': 'All are features of familial hemolytic uremic syndromes except: \nSelect and explain. \nA. Characterized by microangiopathic hemolytic anemia, B. Hemolysis results from an inherited intrinsic red cell abnormalities, C. Atypical HUS is a severe disease with up to 15% moality in the acute phase, D. 50% of cases progressing to end-stage renal disease', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Familial HUS mostly affecting children, characterized by microangiopathic hemolytic anemia (HA) with presence of fragmented erythrocytes in the peripheral blood smear, thrombocytopenia and acute renal failure. The hemolysis results from an inherited defect external to red cells. Atypical HUS is a severe disease with up to 15% moality in the acute phase and up to 50% of cases progressing to end-stage renal disease. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 880', 'role': 'assistant'}]