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 which of the following type of ulcer? \nSelect and explain. \nA. Tropical ulcer, B. Trophic ulcer, C. Venous ulcer, D. Post thrombotic ulcer', 'role': 'user'}, {'content': "Answer: B \nExplanation: Bedsore and perforating ulcers are typical examples of trophic ulcers. Trophic ulcers have punched-out edge with slough in the floor resembling a gummatous ulcer. Factors predisposing its development are: injury, anemia, moisture, pressure and malnutrition. Ref: Bailey and Love's Sho Practice of Surgery, 24th Edition, Page 939; A Manual of Clinical Surgery, 6th Edition, Page 51; Schwaz's Principles of Surgery, 9th Edition, Chapter 9.", 'role': 'assistant'}]