This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'Emergency operation done in cases of \nSelect and explain. \nA. Volvulus, B. Obstructed hernia, C. Appendicular perforation with paralytic ileus, D. Toxic megacolon', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Surgery is required to prevent or relieve ischaemia.When a removable lesion is found in the caecum, ascending colon, hepatic flexure or proximal transverse colon, an emergency right hemicolectomy should be performed. Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1191,1200', 'role': 'assistant'}]