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: Biochemistry
[{'content': 'An example of scleroprotein is \nSelect and explain. \nA. Zein, B. Keratin, C. Glutenin, D. Ovoglobulin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Scleroproteins: They are insoluble in water, salt solutions and organic solvents and soluble only in hot strong acids. They form supporting tissues, e.g. collagen of bone, cartilage and tendon; keratin of hair, horn, nail and hoof. Keratin is one of the examples.\nReference: Vasudevan 7th\xa0 ed, pg 43', 'role': 'assistant'}]