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
[{'content': 'Which of the following is the most abundant glycoprotein present in basement membrane? \nSelect and explain. \nA. Laminin, B. Fibronectin, C. Collagen type 4, D. Heparan sulphate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Laminin is a large extracellular glycoprotein found in basal membrane. It is the most abundant glycoprotein in basement membrane. It is typically cross shaped, formed by 3 disulphide bonded polypeptides. It binds to collagen (type IV), heparin sulphate and enactin. Ref: Robbins Pathologic Basis of Disease 6th Edition, Page 98, 100 ; Heparin and Heparan Sulfate Edited by Hari G. Gar, Page 700', 'role': 'assistant'}]