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 of the following is true about cholesterol? \nSelect and explain. \nA. Made up of 25 carbons, B. There is a hydroxyl group at 5th carbon, C. Contain the cyclic tetra-perhydrophenanthrene ring, D. Amphipathic in nature', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cholesterol : Made up of 27 carbons Ring in cholesterol is cyclo-penta-perhydrophenanthrene (CPP) One of the major constituent of the plasma membrane and of plasma lipoproteins. A hydroxyl group is present at position 3. Due to one -OH group, it has a weak polar character among the mostly non-polar pa. Hence it an amphipathic molecule.', 'role': 'assistant'}]