Which diseases are classified under CORD?

The correct classification for diseases under CORD, which stands for Chronic Obstructive Respiratory Disease, is primarily illustrated by the inclusion of Chronic Bronchitis, Emphysema, and Chronic Asthma. These conditions are all characterized by persistent respiratory symptoms and airflow limitation, which are hallmarks of chronic obstructive diseases.

Chronic Bronchitis involves inflammation and irritation of the bronchial tubes, leading to chronic cough and mucus production. Emphysema refers to the damage of the alveoli in the lungs, which decreases the surface area for gas exchange and contributes to shortness of breath. Chronic Asthma can also lead to obstruction and chronic inflammation of the airways. Together, these conditions encapsulate the concept of CORD as they demonstrate a long-term decline in pulmonary function, aligning with the core definition of chronic obstructive respiratory diseases.

Other options listed, while they may include respiratory and related conditions, do not all fit within the CORD framework. For instance, heart failure is primarily a cardiovascular condition and not classified under chronic obstructive respiratory diseases. Thus, B appropriately captures the essence of CORD by focusing specifically on established conditions that directly contribute to chronic respiratory obstruction.