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
Wound strength of healing is provided by 
Select and explain. 
A. Collagen fibres, B. Blood supply, C. Growth factors, D. Hormones
A: Collagen fibres
Answer: A: Collagen fibres 
Explanation: Type 1 collagen fibres have high tensile strength.