This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cholesterol and Lipoproteins, Subject name: Biochemistry
Apolipoprotein E is rich in - 
Select and explain. 
A. Lysine, B. Arginine, C. Histidine, D. Methionine
B: Arginine
Answer: B: Arginine 
Explanation: Ans. is 'b' i.e., Arginine o Arginine rich apo-E is isolated from VLDL.o It contains arginine to the extent of 10 per cent of the total amino acids and accounts for 5 to 10 per cent of total VLDL apoproteins in normal subjects.