This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Provisional matrix is made up of- 
Select and explain. 
A. Fibrin, B. Fibronectin, C. Fibrinogen, D. All
D: All
Answer: D: All 
Explanation: in secondary healing a provisional matrix containing fibrin, plasma fibronectin, and type III collagen is formed in about 2 weeks this is replaced by a matrix composed primarily of type I collagen ref robbins 9th ed page 108