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
Which of the following is used for wound injection grading? 
Select and explain. 
A. Rank and wakefield classification, B. SEPSIS grading, C. Southampton grading, D. None of the above
C: Southampton grading
Answer: C: Southampton grading 
Explanation: Rank and wakefield classification is for wound.
Southampton wound Grading system and ASEPSIS wound score are used for wound infection grading.