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': 'C17 H31 COOH is formula of: \nSelect and explain. \nA. Linoleic acid, B. Linolenic acid, C. Arachidonic acid, D. Timnodonic acid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In case of a saturated fatty acid, number of hydrogens are double the number of carbons. In this fatty acid, number of carbons are 18. Number of hydrogens are 32. In case of saturated fatty acid, if carbons are 18, then Hydrogen must be 36 (double). So there is loss of 4 H (means 2 double bonds). So, this is Linoleic acid (18 C, 2 double bonds). WITH REGARDS TO OTHER OPTIONS refer table below: OMEGA 3 OMEGA 6 CERVONIC ACID/DHA - 22 Carbons & 6 Double Bonds GAMMA-LINOLENIC ACID- 18 Carbons & 3 Double Bonds ALPHA-LINOLENIC ACID- 18 Carbons & 3 Double Bonds LINOLEIC ACID- 18 Carbons & 2 Double Bonds TIMNODONIC ACID- 20 Carbons & 5 Double Bonds ARACHIDONIC ACID- 20 Carbons & 4 Double Bonds', 'role': 'assistant'}]