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
[{'content': 'All are present in dense granules of platelets except \nSelect and explain. \nA. ADP, B. VWF, C. Calcium, D. Serotonin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]