Which of the following would NOT typically be included in fluid milk?

Fluid milk typically contains a variety of important nutrients, and among them, calcium, vitamin D, and nonfat milk solids are commonly found.

Calcium is a fundamental mineral in milk, essential for bone health and is one of the primary reasons people consume milk. Vitamin D is often added to milk to enhance calcium absorption in the body, making it a standard component in fortified milk products. Nonfat milk solids consist of the proteins, lactose, and minerals present in milk after the fat has been removed, contributing to the nutritional value of nonfat and low-fat milk products.

Iron, on the other hand, is not naturally found in significant amounts in fluid milk. While it is an important nutrient, it is typically obtained from other dietary sources such as meats, beans, and leafy greens. Therefore, when considering the typical composition of fluid milk, iron is the nutrient that is NOT usually included, which aligns with the selected answer.