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: Medicine
[{'content': 'All are endoscopic modalities of treatment of chronic radiation proctitis, EXCEPT: \nSelect and explain. \nA. Bipolar electrocoagulation, B. Laser therapy, C. Argon plasma coagulation, D. Ligation therapy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The goal of endoscopic treatments of CRP is to achieve hemostasis.Modalities are 1. Heater probe 2. Neodymium:yttrium-aluminium garnet (Nd:YAG) laser 3. Potassium titanyl phosphate (KTP) laser 4. Bipolar electrocoagulation Ref:World J Gastroenterol 2011 November 7; 17(41): 4554-4562.', 'role': 'assistant'}]