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': 'True about Collagen: \nSelect and explain. \nA. Triple helix, B. Beta- pleated structure, C. Vit C is necessary for post-translational modification, D. Glycine residue at every third position', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Triple helix', 'role': 'assistant'}]