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': 'All of the following are mediators of acute inflammation except is - \nSelect and explain. \nA. Angiotensin, B. Prostaglandin E2, C. Kallikrein, D. C 3a', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Basic Pathology, Robbins. Page no.: 45 Angiotensin is a peptide hormone that causes vasoconstriction and an increase in blood pressure. It is pa of the renin-angiotensin system, which regulates blood pressure. Angiotensin also stimulates the release of aldosterone from the adrenal coex to promote sodium retention by the kidneys.', 'role': 'assistant'}]