Which of the following compounds is known to function as a hormone?

Keratinisation is the result of which of the following options? 

What population group is most vulnerable to vitamin A toxicity?

How many micrograms of dietary beta-carotene are equivalent to 1 retinol equivalent (RE)?

A person with prolonged and significant vitamin A deficiency would experience

Which of the following describes an association of vitamin A and vision?

Which of the following is not a fat-soluble vitamin?

Approximately what percent of the body’s vitamin A stores are found in the liver?

Which of the following food substances can be converted to vitamin A in the body?

Which of these meals is lowest in vitamin C?