This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Biochemistry
Tocopherols are the derivatives of 
Select and explain. 
A. Isoprenoid ring, B. Tocol, C. Sterol, D. Ribitol
B: Tocol
Answer: B: Tocol 
Explanation: Active vitamine E was isolated from wheat germ oil and named tocopherolA chromane ring(tocol) system with an isoprenoid side chain is present in all naturally occurring tocopherols.Vitamine K is naphthoquinone derivative with a long isoprenoid side chain.Reference: DM Vasudevan biochemistry page no: 460