A、Vitamin A. B、Vitamin B. C、Vitamin C. D、Vitamin D. AWhich kind of vitamin is of primary importance to good eyesight? 根据选项可知问题可能

Vitamins are essential to life. Today there are many kinds of vitamins. A deficiency in many of these can lead to illness.
    Vitamin A is most important for good eyesight. But it is also important for general good health. Liver contains a large amount of vitamin A, but vitamin A is also found in fish, meat, milk, butter, and in some fruits and vegetables.
Vitamin B in fact consists of twelve different chemicals, which are found in eggs, cheese, butter, meal flour and vegetables. If a person does not have enough vitamin B in his diet, it may affect his whole body, particularly the skin, the nervous system and the heart.  Deficiency in vitamin B results in a disease called beri-beri, a sort of disease in feet.
   Vitamin C prevents scurvy and helps to heal wounds. Some doctors. believe that large quantities of vitamin C help people avoid colds. Fruits and uncooked vegetables are rich in vitamin C. a lack of vitamin C can cause a disease called scurvy.
   Vitamin D is essential for the growth of bones and teeth and is found in fish, liver, oil and milk.
   Vitamins can be produced and are sold, but a well balanced diet will provide the necessary amount of vitamins.