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
[{'content': 'Most Common Method Of Radiotherapy is? \nSelect and explain. \nA. Teletherapy, B. Brachytherapy, C. Systemic Radiotherapy, D. Interstitial Radiotherapy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most Common Method of Radiotherapy is External Beam Radiotherapy/Teletherapy', 'role': 'assistant'}]