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: Unknown
Fluidity buffer present in cell membrane is 
Select and explain. 
A. Stearic acid, B. Palmitic acid, C. Cholesterol, D. Linoleic acid
C: Cholesterol
Answer: C: Cholesterol 
Explanation: Membrane fluidity
Membrane fluidity changes with temperature Transition temperature (Tm)
“More is the Tm,less is the fluidity”
Cholesterol-Fluidity buffer
Saturated FAs
increase Tm and decrease fluidity Unsaturated FAs
decrease Tm and increase fluidity