This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of lipid, Subject name: Biochemistry
[{'content': 'All are steroids except \nSelect and explain. \nA. Testosterone, B. Vitamin D, C. Cholesterol, D. Thyroxine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref: Textbook of Medical Biochemistry, 8th Edition, Dr (Brig) MN Chatterjea, Rana Shinde, page no: 589,590', 'role': 'assistant'}]