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: Physiology
[{'content': 'Transition temperature of lipid bilayers of cell membrane is increased by- \nSelect and explain. \nA. Cholesterol, B. Saturated fatty acids, C. Hydrocarbons, D. Unsaturated fatty acids', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e Saturated fatty acids', 'role': 'assistant'}]