This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
[{'content': 'Prostaglandins are derived from: \nSelect and explain. \nA. Stearic acid, B. Arachidonic acid, C. Glutamic acid, D. Aspartic acid', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) Arachidonic acidRef: Lippincott's Biochemistry, 6th ed. P 213* Prostaglandin is derived from the metabolism of arachidonic acid with the help of cyclooxygenase (COX) enzyme.", 'role': 'assistant'}]