Which of the following is not considered a basic nutrient?

The correct choice is based on the classification of nutrients essential for human nutrition. Fats, carbohydrates, and proteins are all fundamental macronutrients that provide energy and support various bodily functions. They are necessary for growth, repair, and overall health.

Chemicals, however, do not fall into the category of basic nutrients. While they may be involved in biological processes and can include vitamins and minerals, they are not classified as macronutrients like fats, carbohydrates, and proteins. Instead, they are often considered micronutrients or other compounds that contribute to health but are not essential for energy production. Therefore, identifying "chemicals" as not a basic nutrient highlights the distinction between essential macronutrients and other dietary components that support but are not classified as foundational nutrients.