This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemistry of Lipids, Subject name: Biochemistry
[{'content': 'All of the following are o3 fatty acids, EXCEPT? \nSelect and explain. \nA. a-Linolenic acid, B. Eicosapentaenoic acid, C. Docosahexaenoic acid, D. g-Linolenic acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Delta system--when counting stas from carboxy end Omega system--when counting stas from the methyl group (omega C) o3 fatty acids are a-Linolenic acid Eicosapentaenoic acid Docosahexaenoic acid g-Linolenic acid (18:3 cis D6,9,12) is a o6 fatty acid. Fatty acid No of carbons No of double bonds Positon Dietary Source alpha-Linolenic acid 18:3 cis-(D9,12,15) 18 3 9,12,15 Flaxseed oil, Soya bean oil Eicosapentaenoic acid (EPA) (Timnodonic acid) 20 (Eicosa) 5 (penta) 5,8,11,14,17 Fish oil Docosahexaenoic acid (DHA) (Cervonic acid) 22 (Docosa) 6 (hexa) 4,7,10,13,16,19 Fish oil', 'role': 'assistant'}]