This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lipids, Subject name: Biochemistry
Most essential fatty acid is: 
Select and explain. 
A. Linolenic acid, B. Linoleic acid, C. Arachidonic acid, D. Eicosapentanoic acid
B: Linoleic acid
Answer: B: Linoleic acid 
Explanation: Ans: b (Linoleic acid) Ref: Vasudevan, 4th ed, p. 156; 5th ed, p. 166Essential fatty acids are linoleic acid and linolenic acidArachidonic acid can be formed if dietary supply of linoleic acid is sufficient.Saponification number -It is the no: of milligrams of KOFI requied to saponily fatty acids in 1 mg of the given fat.Iodine number -Indicates degree of unsaturation.Acid number -Indicates degree of rancidity.Acetyl number -Measures number of OH group present.Used for detection of adulteration in fat.Omega- 3 fatty acids -Linolenic acidTimnodonic acidClupadonic acidCervonic acid