**Core Concept**
The management of acute exacerbation of bronchial asthma involves the use of bronchodilators to relieve bronchospasm and reduce airflow obstruction. The drug of choice is typically a short-acting beta-2 agonist (SABA) due to its rapid onset of action and effectiveness in improving lung function.

**Why the Correct Answer is Right**
Short-acting beta-2 agonists, such as albuterol (salbutamol), work by stimulating the beta-2 receptors in the bronchial smooth muscle, leading to relaxation and bronchodilation. This results in improved airflow and oxygenation, making it easier to breathe. The rapid onset of action, within 5-15 minutes, makes SABAs an ideal choice for acute exacerbations of asthma. The American Thoracic Society (ATS) and the European Respiratory Society (ERS) recommend SABAs as the first-line treatment for acute asthma exacerbations.

**Why Each Wrong Option is Incorrect**
**Option A:** Corticosteroids, such as prednisone, are essential in the management of chronic asthma, but they are not the first-line treatment for acute exacerbations due to their slower onset of action.
**Option B:** Methylxanthines, such as theophylline, have bronchodilatory effects but are not the preferred choice for acute asthma exacerbations due to their narrow therapeutic index and potential side effects.
**Option C:** Anticholinergics, such as ipratropium bromide, can be used in combination with SABAs for acute asthma exacerbations but are not the first-line treatment due to their slower onset of action and potential side effects.

**Clinical Pearl / High-Yield Fact**
The "5-15-30" rule is a useful mnemonic to remember the treatment of acute asthma exacerbations: 5 minutes for SABA administration, 15 minutes for reassessment of symptoms, and 30 minutes for repeat dosing if necessary.

**Correct Answer: A. Albuterol (Salbutamol)**