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
Quarter staggered arrangement is seen in: 
Select and explain. 
A. Immunoglobulin, B. Hemoglobin, C. Collagen, D. Keratin
C: Collagen
Answer: C: Collagen 
Explanation: Ans. C. CollagenTriple Helix in CollagenQuarter Staggered arrangement in CollagenCovalent cross links in collagenDesmosine cross links in elastin