Which are not blood components which are responsible for clot formation?

Which are not blood components which are responsible for clot formation?
A . Platelets
B . Plaque
C . Thrombin
D . Fibrin

Answer: B

Explanation:

Plaque is actually the build up of fatty deposits on the artery walls which narrow and harden the arteries. While a clot often forms around plaque, especially around a plaque rupture, it is not a part of the clotting process. Platelets are the flat disks which stick together forming the thrombus. Fibrin is the small strands of fiber which make up the frame work of the clot making it stronger, like reinforcing rods in concrete. Thrombin is the protein chemo activator which signals the formation of a clotting process.