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
Which of these does not cause crescentric glomerulonephritis - 
Select and explain. 
A. Rapidly progressive glomerulonephritis, B. Alport syndrome, C. Goodpasture syndrome, D. Henoch schonlein purpura
B: Alport syndrome
Answer: B: Alport syndrome 
Explanation: None