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
The element used for intracavitary in carcinoma cervix: 
Select and explain. 
A. Caesium, B. Cobalt-60, C. Strontium, D. Radio iodine
A: Caesium
Answer: A: Caesium 
Explanation: Ans. Caesium