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: Gynaecology & Obstetrics
[{'content': 'Presence of decubitus ulcer in prolapse indicates: \nSelect and explain. \nA. Infection, B. Malignancy, C. Circulatory disturbances, D. Machanical trauma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Circulatory disturbances', 'role': 'assistant'}]