A nurse is discharging a child who has sickle cell anemia after an acute crisis episode. Which of the following instructions should the nurse include in the teaching?

A. There is no need to overly restrict activity; appropriate exercise is encouraged. B. Adequate hydration helps decrease blood viscosity and reduces the risk of vaso-occlusive crises in children with sickle cell anemia. C. Cold compresses may worsen vaso-occlusion; warm compresses are generally preferred. D. While monitoring for fever is important, ensuring proper hydration is a key measure to help prevent future crises.