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: Pathology
Rapidly progressive glomerulonephritis is characterized by - 
Select and explain. 
A. Crescents, B. Splitting of basement membrane, C. Neutrophil infilteration of the mesangium, D. Glomerulosclerosis
A: Crescents
Answer: A: Crescents 
Explanation: None