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: Physiology
procoagulant not normally circulating in the plasma is : 
Select and explain. 
A. Prothrombin, B. Fibrinogen, C. Antithemophilic factor, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: D i.e. None Plasma - is fluid poion of blood, containing an immense number of ions, inorganic molecules & organic molecules that are in transit to various pa of the body . Serum - If whole blood is allowed to clot and the clot is removed , the remaining fluid is serum. - It has same composition as plasma except its fibrinogen, factor 2,5,& 8 have been removed - It has high serotonin content d/t breakdown of platelets during clotting.