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: Dental
[{'content': 'All of the following is true about physical properties of dentin except \nSelect and explain. \nA. Dentin has limited ability to distort and regain its shape, B. Inorganic component comprises of plate shaped hydroxyapatite crystals of diameter 35nm and thickness 10 nm, C. 90% of the organic collagenous component mainly consists of Type 1 collagenous fiber, D. Non collagenous protein comprises of amelogenin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Non collagenous proteins of dentin are\nDecorin and Biglycans ----Prevents premature mineralization\nDentin Phosphoprotein-----Acidic protein, helps in nucleation and crystal growth\nDentin Sialoprotein-----it is ameloblastin like protein containing 10% sialic acid and helps in crystal growth.', 'role': 'assistant'}]