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: Dental
[{'content': 'Most abundant aminoacid in collagen is \nSelect and explain. \nA. Proline, B. Lysine, C. Threonine, D. Glycine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: COLLAGEN Collagens are triple helices formed by amino acid chains where every third residue is glycine (Gly-X-Y), with a high likelihood of proline and hydroxyproline/ hydroxylysine in the X and Y positions, respectively. Ref:- Review of Dermatology by Alikhan; pg num:-7', 'role': 'assistant'}]