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: Biochemistry
[{'content': 'Cholesterol structurally belongs to molecule \nSelect and explain. \nA. Steroid, B. Carbohydrate, C. Urea, D. Peptide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Steroid\n\nSterols are a class of steroids which contain one or more hydroxy (OH) groups.\nCholesterol is the most important sterol.', 'role': 'assistant'}]