This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of lipid, Subject name: Biochemistry
Examples of monounsaturated fatty acids are 
Select and explain. 
A. Oleic, B. Arachiodonic acid, C. Linolenic acid, D. Lysine
A: Oleic
Answer: A: Oleic 
Explanation: Monounsaturated (Monoethenoid) fatty acids: They contain one double bond. Their general formula is Cn H2n-1 COOH Example: Oleic acid C17H33 COOH is found in nearly all fats (formula 18: 1; 9)Ref: M.N. Chatterjee - Textbook of Biochemistry, 8th edition, page no: 47