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': 'Skin loss extending to fascia, muscle and Bone, belongs to which grade of pressure sore? \nSelect and explain. \nA. Grade 2, B. Grade 3, C. Grade 4, D. Grade 5', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Grading of Pressure Sores :\nGrade 1 - Non blanchable erythema.\nGrade 2 - Prtial thickness skin loss extending to epidermis and dermia.\nGrade 3 - Full thickness skin loss extending to subcutaneous tissue.\nGrade 4 : Skin loss extends to fascia + muscles + Bone or tendon or Joint.', 'role': 'assistant'}]