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
All are endoscopic modalities of treatment of chronic radiation proctitis, EXCEPT: 
Select and explain. 
A. Bipolar electrocoagulation, B. Laser therapy, C. Argon plasma coagulation, D. Ligation therapy
D: Ligation therapy
Answer: D: Ligation therapy 
Explanation: 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.