This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Pathology
Basement membrane collagen is 
Select and explain. 
A. IV, B. II, C. V, D. VI
A: IV
Answer: A: IV 
Explanation: (IV): (170 Harsh mohan 6th edition)Basement membrane are PAS positive amorphous structures that lies underneath epithelia of different organs and endothelial cells, they consist of collagen type IVand laminin**