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 one of the following is not a wound closure technique? 
Select and explain. 
A. Partial thickness skin graft, B. Composite graft, C. Vascular graft, D. Musculo-cutaneous graft
C: Vascular graft
Answer: C: Vascular graft 
Explanation: None