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': 'Which is an omega - 9 fatty acid: \nSelect and explain. \nA. Cervonic acid, B. Oleic acid, C. Linolenic acid, D. Arachidonic acid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Oleic acid Mono-unsaturated or monoenoic fatty acid 18 Carbons with one double bond at C-9. So, it is a omega-9 fatty acid. Cervonic acid(DHA- Docosa Hexaenoic Acid) 22 C and 6 double bonds (Docosa means 22, Hexaenoic means 6 double bonds). This fatty acid belongs to omega-3 category. Found in breast milk. Linoleic acid 18 C, 2 double bonds. Precursor of omega-6 category. Arachidonic acid 20 C, 4 double bonds. Synthesis of Prostaglandins and Leukotrienes.', 'role': 'assistant'}]