Final answer:
Cabbage is the best recommendation for a food item high in vitamin C compared to milk, eggs, and liver. It supports iron absorption and can help reduce cold symptoms.
Step-by-step explanation:
The nurse should recommend cabbage as the food item highest in vitamin C. While all options provided do contain some level of vitamins and nutrients, cabbage is particularly rich in vitamin C, which aids in the absorption of iron from the intestine and can reduce the duration and severity of the common cold when consumed in high doses. Other rich sources of vitamin C include citrus fruits, green vegetables, guavas, berries, and melons. For adults, the daily requirement of vitamin C is about 70 mg.