This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
[{'content': 'There is a pressure sore extending into the subcutaneous tissue but underlying structures are not involved. Stage of the pressure sore is \nSelect and explain. \nA. Stage 1, B. Stage 2, C. Stage 3, D. Stage 4', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Stage 1Non-blanchable erythema without a breach in theepidermisStage 2Paial-thickness skin loss involving the epidermis and dermisStage 3Full-thickness skin loss extending into the subcutaneous tissue but not through underlying fasciaStage 4Full-thickness skin loss through fascia with extensive tissue destruction, maybe involving muscle, bone, tendon or joint Bailey and Love 27e pg: 29', 'role': 'assistant'}]