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: Surgery
[{'content': 'Bedsore is an example of - \nSelect and explain. \nA. Tropical ulcer, B. Trophic ulcer, C. Venous ulcer, D. Post thrombotic ulcer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: "Trophic ulcers are neurogenic ulcers which are caused by various factors such as impairment of nutrition of the tissues, inadequate blood supply and neurological deficit.\nBed sore is included in the group of "trophic ulcers"', 'role': 'assistant'}]