<prompt> Which is the most essential fatty acid?Linolenic acidLinoleic acidArachidonic acidOleic acid  <response>: Most essential fatty acid is Linoleic acid 18-C, 2 double bonds. Linoleic acid Precursor of omega-6. Synthesize : Gamma Linolenic acid Arachidonic acid. Polyunsaturated fatty acids Essential Fatty Acids EFA Cannot be synthesized in body. Enzymes that can introduce double bonds beyond 9th carbonare absent in humans. 2 essential fatty acids in diet - Linoleic and a-Linolenic acid. Most Essential Fatty Acid- Linoleic acid because it can synthesize Arachidonic acid. 