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
Radioactive gold is used in: 
Select and explain. 
A. Bladder tumours, B. Malignant ascites, C. Gliomas, D. None
B: Malignant ascites
Answer: B: Malignant ascites 
Explanation: Ans. Malignant ascites