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
[{'content': 'String of beads appearance on angiography is seen in \nSelect and explain. \nA. Fibromuscular dysplasia, B. Renal stones, C. Bladder stones, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: String of beads or pile of plates appearance is seen in fibromuscular dysplasia.', 'role': 'assistant'}]