This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Thromboxane A2, \nSelect and explain. \nA. Formed by platelets, B. Formed from PGG,IPGR, C. Prothrombotic, D. All', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'a' i.e., Formed by platelets; 'b' i.e., Formed from PGG2/PGH2 ; 'c' i.e., Prothrombotic Thromboxane A2 (TXA21 o TXA, is synthesized by platelets from arachidonic acid PGG2 and PGH2 intermediate through cycloxygenase pathway. o It is a potent inducer of platelets aggregation --> prothrombotic activity. o It is a vasoconstrictor.", 'role': 'assistant'}]