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: Biochemistry
[{'content': 'The metabolically most active plasma lipid is: \nSelect and explain. \nA. Triacylglycerols, B. Phospholipids, C. Free fatty acids, D. Cholesteryl  esters', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Plasma lipids consist of triacylglycerols (16%), phospholipids\xa0(30%),\xa0cholesterol\xa0(14%),\xa0and\xa0 cholesteryl\xa0esters\xa0(36%) and a much smaller fraction of unesterified long-chain fatty acids (free fatty acids or FFA) (4%). This latter fraction, the\xa0FFA, is metabolically the most active of the plasma lipids.\nHARPERS ILLUSTRATED BIOCHEMISTRY30th ed, Page No:254', 'role': 'assistant'}]