. Select the incorrect statement from the following:

(a) Clot or coagulum is formed mainly by a network of fibrin in which the died and damaged formed element of blood are trapped.

(b) Inactive fibrinogen is converted to fibrin by the hormone thrombin.

(c) Prothrombin is converted into thrombin by the enzyme complex thrombokinase.

(d) Platelet or injured tissue released certain factors which initiate coagulation.​