This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
Collagen present in skin is 
Select and explain. 
A. Type I, B. Type II, C. Type IV, D. Type V
A: Type I
Answer: A: Type I 
Explanation: Collagen * Collagen is the most abundant protein in the human body, have a triple helical structure * At least 28 distinct types of collagen made up of over 30 distinct polypeptide chains have been identified in human tissues * The main fibril forming collagens in skin and bone and in cailage, respectively, are types I and II. Ref:- Harper 30/e; pg num:- 628 , Lippincott 7/e; Pg Num:- 44