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
Thromboxane A2- 
Select and explain. 
A. Formed by platelets, B. Formed from PGG2\/PGH2, C. Prothrombotic, D. Vasoconstrictor
A: Formed by platelets
Answer: A: Formed by platelets 
Explanation: Robbins basic pathology 9th edition, page no:46 Platelets contain the enzyme thromboxane synthase producing thromboxane A2.