**Question:** Although asthma is a heterogeneous disease, all individuals with asthma would be most likely to:

**Core Concept:** Asthma is a chronic respiratory condition characterized by inflammation and airway hyperresponsiveness, leading to recurrent episodes of wheezing, coughing, chest tightness, and shortness of breath. The disease is heterogeneous, meaning it has various underlying mechanisms and presentations.

**Why the Correct Answer is Right:** The correct answer refers to the common clinical presentation and management approach for asthma patients. Inhaled corticosteroids (ICS) are a mainstay of asthma treatment due to their potent anti-inflammatory effects. They work by reducing airway inflammation, stabilizing airway smooth muscle, and inhibiting eosinophil activation. ICS are prescribed for both mild and severe asthma, and can prevent exacerbations, reduce the need for rescue medications, and improve lung function.

**Why Each Wrong Option is Incorrect:**

A. Bronchodilators: These are used to relieve asthma symptoms temporarily by relaxing airway smooth muscle. While they are essential for acute asthma attacks, their long-term use can lead to desensitization and decreased effectiveness.

B. Immunotherapy: This involves administering increasing doses of allergen-containing extracts to desensitize the patient to allergens causing asthma. It is not suitable for all patients and is not considered a first-line treatment for asthma management.

C. Pulmonary rehabilitation: This is a comprehensive approach for COPD patients to improve exercise capacity, quality of life, and self-management skills. It is less relevant for asthma patients.

D. Oxygen therapy: This is indicated in severe hypoxia or when patients experience cyanosis, restlessness, or signs of cerebral hypoxia. It is not a primary treatment for asthma symptoms.

**Clinical Pearl:** In asthma management, a combination of ICS and long-acting beta2-agonists (LABAs) is often used, as they provide better bronchodilation and airway remodeling prevention than using either drug alone. This combination therapy is essential for the effective treatment of asthma.

**Correct Answer:** D. Inhaled corticosteroids (ICS)