Which of the following are B vitamins?

Check ALL that apply.

A). ascorbic acid
B). retinol
C). calciferol
D). thiamine
E). niacin

To determine which of the options are B vitamins, we need to have some knowledge about what B vitamins are. B vitamins are a group of water-soluble vitamins that play important roles in cell metabolism. With this information, let's go through each option:

A). Ascorbic acid: Ascorbic acid is also known as vitamin C and is not a B vitamin. It is a different type of vitamin that is not part of the B vitamin group.

B). Retinol: Retinol is a form of vitamin A and is not a B vitamin. Vitamin A is different from the B vitamins.

C). Calciferol: Calciferol is another name for vitamin D and is not a B vitamin. Like vitamin A and C, vitamin D belongs to a different vitamin group.

D). Thiamine: Thiamine is also known as vitamin B1, and it is one of the B vitamins. Thus, option D is a B vitamin.

E). Niacin: Niacin is another name for vitamin B3, which is also one of the B vitamins. Thus, option E is a B vitamin.

In conclusion, the B vitamins among the given options are D) thiamine and E) niacin.

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