This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cholesterol synthesis and bile acids, Subject name: Biochemistry
[{'content': 'Which among the following is the function of cholesterol in the Plasmalemma: \nSelect and explain. \nA. Increase fluidity of the lipid bilayer., B. Decrease fluidity of the lipid bilayer, C. Facilitate the diffusion of ions through the lipid bilayer, D. Assist in the transpo of hormones across the lipid bilayer', 'role': 'user'}, {'content': "Answer: B \nExplanation: The fluidity of the lipid bilayer is decreased in 3 ways: (1) By lowering the temperature, (2) By increasing the saturation of the fatty acyl tails of the phospholipid molecules, and (3) By increasing the membrane's cholesterol content Cholesterol interacts with phospholipids containing unsaturated fatty acyl chains, compacting them and constraining their motion in bilayers, hence decreases the fluidity.", 'role': 'assistant'}]