This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Acute phase reactants are all except- \nSelect and explain. \nA. C-reactive protein, B. Haptaglobulin, C. Endothelin, D. Fibrinogen', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Endothelin is a vasoconstrictive mediator released in response to endothelial dysfunction. Basic Pathology, Robbins. Page no.: 484', 'role': 'assistant'}]