This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
[{'content': 'Quarter staggered arrangement is seen in: \nSelect and explain. \nA. Immunoglobulin, B. Hemoglobin, C. Collagen, D. Keratin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. CollagenTriple Helix in CollagenQuarter Staggered arrangement in CollagenCovalent cross links in collagenDesmosine cross links in elastin', 'role': 'assistant'}]