Among the following, which one is not part of the vitamin B group:
Riboflavin
Niacin
Cyanocobalamine
Tocopherol
Tocopherol does not belong to the vitamin B group. Tocopherol is actually a form of vitamin E, not a member of the vitamin B complex. The vitamin B group includes Riboflavin (B2), Niacin (B3), and Cyanocobalamin (B12), which are essential for various metabolic processes in the body. Hence, the correct answer is option 4.