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: Radiology
String of beads appearance on angiography is seen in 
Select and explain. 
A. Fibromuscular dysplasia, B. Renal stones, C. Bladder stones, D. All of the above
A: Fibromuscular dysplasia
Answer: A: Fibromuscular dysplasia 
Explanation: String of beads or pile of plates appearance is seen in fibromuscular dysplasia.