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': 'Essential fatty acids are except: \nSelect and explain. \nA. Arachidonic acid, B. Linoleic acid, C. Palmitic acid, D. Linolenic acid', 'role': 'user'}, {'content': "Answer: C \nExplanation: The essential fatty acids are polyunsaturated fatty acids, linoleic acid (18:26) and linolenic acid (18:33). Arachidonic acid (20:46) is derived from dietary linoleic acid and is present primarily in membrane phospholipids. Impoant derivatives of linolenic acid are eicosapentaenoic acid (20:63) and docosahexaenoic acid (DHA, 22:63) found in human milk and brain lipids.Palmitic acid is a common saturated fatty acid. Ref : Botham K.M., Mayes P.A. (2011). Chapter 23. Biosynthesis of Fatty Acids & Eicosanoids. In D.A. Bender, K.M. Botham, P.A. Weil, P.J. Kennelly, R.K. Murray, V.W. Rodwell (Eds), Harper's Illustrated Biochemistry, 29e.", 'role': 'assistant'}]