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': 'Which of these does not cause crescentric glomerulonephritis - \nSelect and explain. \nA. Rapidly progressive glomerulonephritis, B. Alport syndrome, C. Goodpasture syndrome, D. Henoch schonlein purpura', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]