Which plasma protein is necessary for adhesion of platelets to subendothelialfibres?: (A) Glycoprotein IIb, (B) Von Willebrand factor, (C) Platelet factor 3, (D) Factor X
Answer is B. Ans. (b) Von Willebrand factor(Ref: Robbins 9th/pg 661)Von Willebrand factor is necessary for adhesion of platelets to subendothelial fibres.