Which of the Following Is a Feature of Vitamin a Nutrition

Which of the following is a feature of vitamin A nutrition?

A) Deficiency is common in both the United States and many developing countries.
B) Toxicity occurs from excess intakes of preformed vitamin A as well as beta-carotene.
C) Supplements are recommended for certain groups of infants and children infected with the measles in the United States.
D) In poor countries, supplements prevent and cure night blindness but offer little protection against malaria and lung disease.
E) The risk of toxicity is so high that most vitamin A supplements are by prescription only.