A nurse is reinforcing teaching with the parents of a school-age child who has cystic fibrosis. Which of the following statements should the nurse make?

A. "Bradycardia is an early indicator of a pneumothorax.": Bradycardia is not an early indicator of a pneumothorax. Common signs of pneumothorax in cystic fibrosis include sudden chest pain, difficulty breathing, and decreased breath sounds, not bradycardia. B. "Administer a bronchodilator to the child after chest percussion therapy.": Chest percussion helps loosen secretions, and bronchodilators should be administered after the therapy to help open the airways and allow the mucus to be cleared more effectively. C. "Engage the child in daily aerobic exercise.": While exercise is beneficial for children with cystic fibrosis, it should be tailored to the child's physical condition. Aerobic exercise might not be suitable for all children with CF, especially during exacerbations or respiratory distress. D. "A pigeon-shaped chest might become evident as the disease progresses.": While a pigeon-shaped chest (pectus carinatum) can occur with CF due to chronic lung infections and hyperinflation, it is not the most immediate concern compared to respiratory therapy or infection control.