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: Pathology
Deficiency of which of the following element will impair wound healing: 
Select and explain. 
A. Zn, B. Cu, C. Fe, D. Na
A: Zn
Answer: A: Zn 
Explanation: Zn is a co-factor in collagenase.