This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Prostaglandins, Subject name: Pharmacology
[{'content': 'Prostaglandin is obtained from: \nSelect and explain. \nA. Steric acid, B. Arachidonic acid, C. Linoleic acid, D. Linolenic acid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Arachidonic acidPhospholipid are acted upon by phospholipase A2 which converts it into Arachidonic acid. Arachidonic acid if acted upon by COX enzyme then it forms Prostaglandin and if LOX enzyme then to leukotriene.', 'role': 'assistant'}]