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
[{'content': 'Features of intestitial therapy are all except: \nSelect and explain. \nA. Only used in head & neck, B. | Damage to normal tissue, C. Temporary or permanent, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Only used in head & neck', 'role': 'assistant'}]