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
Most common method of radiation dose delivery is: 
Select and explain. 
A. Teletherapy, B. Electron beam, C. Brachytherapy, D. Radio immunotherapy
A: Teletherapy
Answer: A: Teletherapy 
Explanation: Teletherapy REF: therapy, "External radiation therapy (also known as Teletherapy) is the most common kind of radiation therapy"