Question

Identify the steps in the formation of vitamin \(\text{D}_{3}\):

A. Vitamin \(\text{D}_{4}\) \(\rightarrow\) 25-Hydroxycholecalciferol

B. Provitamin \(\text{D}_{3}\) \(\xrightarrow{\text{Sunlight}}\) Vitamin \(\text{D}_{3}\)

C. 7-Dehydrocholesterol \(\xrightarrow{\text{Sunlight}}\) Provitamin D

D. 25-Hydroxycholecalciferol \(\rightarrow\) Vitamin \(\text{D}_{3}\)

Choose the correct answer from the options given below:

• A. B and C only \
• B. A and D only \
• C. A and B only \
• D. D and C only

Hint:

Sunlight splits 7-dehydrocholesterol to form previtamin D, which then spontaneously rearranges into Vitamin $\text{D}_{3}$ inside the skin layers.

Answer 1

The Correct Option is A