Final answer:
In South America, cereals are often fortified with vitamin A to help combat deficiencies, especially among children, where it's essential for immune system development and preventing health issues like impaired vision.
Step-by-step explanation:
In South America, one common strategy to combat vitamin A deficiency is the fortification of certain food items. While the question specifically asks about foods fortified with vitamin A, the provided list includes a variety of foods that are naturally rich in vitamins but does not clearly specify which ones are fortified. However, one can infer that among the commonly fortified foods, cereals are often enriched with essential vitamins, including vitamin A. These enriched breads and cereals are designed to provide additional nutrients to help prevent deficiencies in the populations that rely on them as dietary staples. Vitamin A plays a crucial role in supporting the immune system, and its deficiency can lead to serious health issues such as impaired vision and increased susceptibility to infections. Therefore, fortification efforts are important in preventing these health problems, especially in children where vitamin A is vital for immune system development.