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
RBC cast in the microscopic examination of the urine is an indicator of - 
Select and explain. 
A. Acute glomerulonephritis, B. Acute Pyelonephritis, C. Chronic glomerulonephritis, D. Nephrotic syndrome
A: Acute glomerulonephritis
Answer: A: Acute glomerulonephritis 
Explanation: None