Answer the following question given this paragraph: Vitamins are organic compounds that the body needs in small amounts to function properly. Humans need 16 different vitamins. Six of them are listed in Table below . Vitamin D is made in the skin when it is exposed to sunlight. Bacteria that normally live in the gut make vitamins B12 and K. All other vitamins must come from food. The table shows good food sources of the vitamins. Q: Vitamin d is made in the skin when it is exposed to what? A:

Available choices:
i. darkness.
ii. water.
iii. dirt.
iv. sunlight.
The answer is:
iv.