Which of the following are examples of B vitamins?

B vitamins are a group of water-soluble vitamins that play important roles in cell metabolism and energy production. They include various specific vitamins such as B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin), B9 (folate), and B12 (cobalamin).

In this case, B12 and B6 are clearly identified as B vitamins. Vitamin B12 is essential for nerve function and the production of DNA and red blood cells, while Vitamin B6 is important for protein metabolism and cognitive development.

The other options include vitamins that do not belong to the B vitamin group. For example, Vitamin A and D are fat-soluble vitamins, and while important for vision and bone health respectively, they are not classified as B vitamins. Folate is indeed a B vitamin, specifically B9, but Vitamin C is not part of the B complex; it is a vitamin that plays a role in antioxidant protection and collagen synthesis, among other functions. Therefore, the correct answer highlights that B12 and B6 are both members of the B vitamin family.