This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nephrotic and Nephritic syndrome, Subject name: Medicine
Most common cause of glomerulonephritis is? 
Select and explain. 
A. Berger disease, B. Acute Glomerulonephritis, C. Chronic glomerulonephritis, D. Focal segmental Glomerulosclerosis
A: Berger disease
Answer: A: Berger disease 
Explanation: Most common cause of glomerulonephritis is Berger disease. Focal segmental glomerulosclerosis is most common cause of nephrotic syndrome.