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
Which protein is abundant in our body: 
Select and explain. 
A. Collagen, B. Albumin, C. Myoglobin, D. Hemoglobin
A: Collagen
Answer: A: Collagen 
Explanation: Ans. (a) CollagenRef: Harrisons, 19th ed. pg. 2504* Collagen is the most abundant protein in the body.* Harrisons states: "The first genes cloned for connective tissues were the two genes coding for type I collagen, the most abundant protein in bones, skin, tendons, and several other tissues.