<prompt> Which of the following fatty acid is a precursor of arachidonic acid?Linoleic acidLinolenic acidOleic acidPalmitoic acid  <response>: Arachidonic acid is a 20-carbon polyunsaturated fatty acid 5,8,11,14-eicosatetraenoic acid that is derived from dietary sources or by conversion from the essential fatty acid linoleic acid. Ref: Robbins 8th edition, Chapter 2. 