Which of the following is not considered a major class of nutrients?

Nucleic acids are not classified as a major class of nutrients, while proteins, carbohydrates, and vitamins are recognized as such. Major classes of nutrients include macronutrients (proteins, carbohydrates, and fats) and micronutrients (vitamins and minerals). Each of these plays essential roles in the body's functioning, contributing to energy production, growth, and overall health.

Nucleic acids, including DNA and RNA, primarily serve as carriers of genetic information and are involved in protein synthesis. While they are crucial for cellular function and heredity, they do not fulfill dietary energy or nutritional requirements in the same way that proteins, carbohydrates, and vitamins do. Therefore, nucleic acids are categorized differently in the context of nutrition, which is why they are not considered a major class of nutrients.