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: Surgery
[{'content': 'Fibroblast in healing wound derived from - \nSelect and explain. \nA. Local mesenchyme, B. Epithelium, C. Endothelium, D. Vascular fibrosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]