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Blood coagulation is a complex process involving a cascade of clotting factors. The final stage of this process involves the conversion of soluble plasma protein fibrinogen into insoluble fibrin threads.
The enzyme thrombin acts on the soluble protein fibrinogen to convert it into insoluble fibrin. The reaction is represented as: $$Fibrinogen \xrightarrow{Thrombin} Fibrin$$
Option (A) states that Fibrinogen is produced from Fibrin, which is the reverse of the biological process. Option (D) correctly states that Fibrin is produced from Fibrinogen. Since the question asks for the incorrect statement, Option (A) is the correct choice.
Final Answer: (A)