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
Physiological active form of cholesterol is: 
Select and explain. 
A. Lipoprotein, B. Lipid, C. Free cholesterol, D. None of the above
C: Free cholesterol
Answer: C: Free cholesterol 
Explanation: Free Cholesterol is considered as physiological active form of the cholesterol.