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
All are steroids except 
Select and explain. 
A. Testosterone, B. Vitamin D, C. Cholesterol, D. Thyroxine
D: Thyroxine
Answer: D: Thyroxine 
Explanation: Ref: Textbook of Medical Biochemistry, 8th Edition, Dr (Brig) MN Chatterjea, Rana Shinde, page no: 589,590