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': 'Platelet aggregation is caused by - \nSelect and explain. \nA. Nitrous oxide, B. Thromboxone A2, C. Aspirin, D. PGI2', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Robbins basic pathology 9th edition page no 46, Answer is option 2, thromboxaneA2 Thromboxane A2 is a potent platelet aggregating agent and a vasoconstrictor, is the major prostaglandin produced in these cells. Itvis an intrmediate produced in the cyclooxygenase pathway by the enzyme thromboxane synthase.', 'role': 'assistant'}]