This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Quaer staggered arrangement is seen in 
Select and explain. 
A. Immunoglobulin, B. Hemoglobin, C. Keratin, D. Collagen
D: Collagen
Answer: D: Collagen 
Explanation: The collagen fibres have a triple stranded,quaer staggered arrangement. This arrangement helps in mineralization Tropocollagen molecules are arranged in a "quater-staggered array" to form collagen fibres . Reference: Harpers illustrated biochemistry 31st edition pg 593