This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lipids, Subject name: Biochemistry
[{'content': 'Unsaturated fatty acids are converted to: \nSelect and explain. \nA. Prostaglandins, B. Cholesterol, C. Cell membrane lipid, D. Saturated fatty acid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A Harper, 26lh ed. p. 192 & 25th ed, p. 250', 'role': 'assistant'}]