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
[{'content': 'Main cell responsible for scar contraction is: \nSelect and explain. \nA. Myofibroblast, B. Fibroblast, C. Epithelial cell, D. Elastin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]