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': 'RBC casts are found in -a) DMb) Wegeners Granulomatosisc) SLEd) Ankylosing spondylitise) Acute glomerulonephritis \nSelect and explain. \nA. ab, B. bc, C. acd, D. bce', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]