This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Fluidity of the membrane is maintained by: \nSelect and explain. \nA. Cholesterol, B. Carbohydrates, C. Proteins, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cholesterol maintainds the fluidity of the membrane Poly unsaturated fatty acids increase fluidity Saturated fatty acids decreases fluidity', 'role': 'assistant'}]