This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure and function of protein, Subject name: Biochemistry
Type of collagen in Basement membrane 
Select and explain. 
A. Type I, B. Type II, C. Type III, D. Type IV
D: Type IV
Answer: D: Type IV 
Explanation: Ref: Harper&;s Biochemistry; 30th edition; Chapter 50; The Extracellular Matrix