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': 'Keloid scar is made up of - \nSelect and explain. \nA. Dense collagen, B. Loose fibrous tissue, C. Granulamatous tissue, D. Loose areolar tissue', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]