This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Serotonin is sexreted by \nSelect and explain. \nA. Leukocytes, B. RBCs, C. Platelets, D. Vessel wall', 'role': 'user'}, {'content': 'Answer: C \nExplanation: platet seretonin normally the seratonin secreted from the enterochromaffin cells enters the blood stream . the platelets when bind to the clot release seratonin where it xan help in vaso constriction or dilation and hels in hemostasis Ref: Katzung 12 th ed.', 'role': 'assistant'}]