This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
maximum fluidity of the cell membrane is due to ? 
Select and explain. 
A. linolenic acid, B. linoleic acid, C. palmitic acid, D. arachadonic acid
B: linoleic acid
Answer: B: linoleic acid 
Explanation: Cholesterol * Increase in cholesterol conc. - less fluid on outer surface, more fluid on inner surface Effect of cholesterol on fluidity is different with different temperature. At temperature below Tm - cholesterol increases fluidity At temperature above Tm - cholesterol decreases fluidity ref : guyton and hall