This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
One of the following is having the least density - 
Select and explain. 
A. Chylomicron, B. HDL, C. LDL, D. VLDL
A: Chylomicron
Answer: A: Chylomicron 
Explanation: Chylomicrons

HDL is the smallest with least lipid contents and therefore is the most dense lipoprotein. Chylomicrons are largest with maximum lipid contents and therefore are the least dense lipoprotein molecules.