This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
[{'content': 'Alpha granules of platelets contain all Except \nSelect and explain. \nA. Fibronectin, B. Platelet factor-4, C. Platelet-derived growth factor, D. Serotonin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Alpha granules contain P.Selectin, Fibrinogen, Coagulation factor V, VWF, Fibronectin, Platelet factor 4, PDGF, TGF bDelta granules contains ADP, ATP, ionized Ca, Serotonin, EpinephrineReference: Robbins and Cotran Pathologic Basis of Disease; 9th edition; Volume I; Page no: 117', 'role': 'assistant'}]