Final answer:
The nurse should recommend red meat as the highest source of zinc for a patient with chronic skin ulcers.
Step-by-step explanation:
The nurse should recommend red meat as containing the highest amount of zinc. Red meat is a rich source of zinc, along with other foods such as seafood, organ meats, nuts, legumes, chocolate, enriched breads, and cereals. Zinc plays an important role in wound healing, making it beneficial for a patient with chronic skin ulcers.