This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiotherapy Pa 1, Subject name: Radiology
Most Common Method Of Radiotherapy is? 
Select and explain. 
A. Teletherapy, B. Brachytherapy, C. Systemic Radiotherapy, D. Interstitial Radiotherapy
A: Teletherapy
Answer: A: Teletherapy 
Explanation: Most Common Method of Radiotherapy is External Beam Radiotherapy/Teletherapy