Which of the following is an essential component of asthma self-management education for patients?

Rationale: A. Medications should be taken as prescribed, not only when symptoms are severe, to prevent exacerbations. B. Physical activity should not be completely avoided; with proper management, patients with asthma can usually remain active. C. Understanding how to use a peak flow meter is essential in asthma self-management because it helps patients monitor lung function, detect early signs of exacerbations, and take timely action. D. A high-caffeine diet is not recommended as a management strategy for asthma.