This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Pathology
Which one of the following impairs epithelialization in wound healing? 
Select and explain. 
A. BGF, B. PDGF, C. Fibronectin, D. TGF
A: BGF
Answer: A: BGF 
Explanation: (A) BGF