This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
The most abundant glycoprotein present in basement membrane is - 
Select and explain. 
A. Laminin, B. Collagen type IV, C. Fibronectin, D. Heparin sulphate
A: Laminin
Answer: A: Laminin 
Explanation: Laminin and Collegen type IV form tightly bound networks in basement membrane