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: Medicine
[{'content': 'RBC casts are found in - \nSelect and explain. \nA. DM, B. Wegeners Granulomatosis, C. SEE, D. Ankylosing spondylitis', 'role': 'user'}, {'content': "Answer: B \nExplanation: One of the component of Wegener's granulomatosis is focal or diffuse necrotising glomerulonephritis , which is the reason for the presence of RBC casts. Ref Harrison20th edition pg 2122", 'role': 'assistant'}]