This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
All are present in dense granules of platelets except 
Select and explain. 
A. ADP, B. VWF, C. Calcium, D. Serotonin
B: VWF
Answer: B: VWF 
Explanation: VWF is present in alfa granules of platelets and is associated with clotting Dense granules contains nucleotides,bioactive amines,cations,polyphosphates Ref:Guyton and Hall textbook of medical physiology 12th edition,page number:142,143,144