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': 'Factor I and H deficiency causes \nSelect and explain. \nA. Typical HUS, B. Atypical HUS, C. TTP, D. Acute TTP', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A typical HUS\xa0(Non - epidemic, diarrhea negative) : common cause factor H & I deficiency.', 'role': 'assistant'}]