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: Pathology
Brachytherapy means 
Select and explain. 
A. Chemotherapy, B. Radiation administered interstially through catheters, C. Lasers, D. Radiation involving normal tissues
B: Radiation administered interstially through catheters
Answer: B: Radiation administered interstially through catheters 
Explanation: None