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
True about Collagen: 
Select and explain. 
A. Triple helix, B. Beta- pleated structure, C. Vit C is necessary for post-translational modification, D. Glycine residue at every third position
A: Triple helix
Answer: A: Triple helix 
Explanation: A i.e. Triple helix