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
Which of the following has highest electrophoretic mobility and least lipid content? 
Select and explain. 
A. Chylomicrons, B. HDL, C. LDL, D. VLDL
B: HDL
Answer: B: HDL 
Explanation: Ans. B. HDL(Ref: Harper 31/e page 237, Table 25-1)HDLAlpha lipoproteinLeast diameterMaximum electrophoretic mobility.Maximum protein content.Least lipid contentCarry cholesterol from peripheral tissues to liver and other steroidogenic tissuesThis is called reverse cholesterol transportThis makes HDL cholesterol "the good cholesterol"The major role of HDL is to acts as the repository for apo C and apo E required for the metabolism of VLDL and chylomicron.