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
Cholesterol is a (an) 
Select and explain. 
A. Ester, B. Phospholipid, C. Sterol, D. Lipoprotein
C: Sterol
Answer: C: Sterol 
Explanation: Sterol

Cholesterol is the most important sterol.