This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inflammation & Repair, Subject name: Pathology
[{'content': 'Which arachidonic acid metabolite is vasoconstrictor? \nSelect and explain. \nA. TXA2, B. PGI2, C. PGD2, D. PGE2', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., TXA2", 'role': 'assistant'}]