This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of Skin, Subject name: Skin
[{'content': 'Substance common in skin, hair and nail is? \nSelect and explain. \nA. Vimentin, B. Keratin, C. Laminin, D. Nectin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) KeratinRef.: Bolognia dermatology ch: 55', 'role': 'assistant'}]