This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Wound Healing, Subject name: Pathology
[{'content': 'Wound contraction is mediated by? \nSelect and explain. \nA. Epithelial cell, B. Myofibroblasts, C. Collagen, D. Elastin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Wound contraction is initially caused by myofibroblasts and later by cross-linking of collagen fibers.', 'role': 'assistant'}]