**Core Concept**
Salbutamol is a short-acting β2 adrenergic receptor agonist (SABA) used in the management of asthma and chronic obstructive pulmonary disease (COPD) for bronchodilation. Its effects are mediated through the activation of β2 receptors in the airway smooth muscle, leading to relaxation and bronchodilation.

**Why the Correct Answer is Right**
The correct answer is one option that is NOT a side effect of salbutamol. Salbutamol can cause various side effects due to its β2 agonist activity, including:
- Tachycardia: Activation of β2 receptors in the heart leads to increased heart rate.
- Tremors: Stimulation of β2 receptors in skeletal muscle causes muscle tremors.
- Hypokalemia: Salbutamol can cause potassium loss due to increased cellular uptake of potassium ions.
- Insulin release: Activation of β2 receptors in the pancreas leads to increased insulin release.

**Why Each Wrong Option is Incorrect**
**Option A:**
Incorrect because this option is a known side effect of salbutamol. (Insert the actual option here)

**Option B:**
Incorrect because this option is a known side effect of salbutamol. (Insert the actual option here)

**Option C:**
Incorrect because this option is a known side effect of salbutamol. (Insert the actual option here)

**Clinical Pearl / High-Yield Fact**
To remember the side effects of salbutamol, recall the "TREMS" acronym: Tremors, Tachycardia, Rebound bronchospasm, Excitement, Mood swings, and Sedation. However, note that salbutamol is not typically associated with mood swings or sedation.

**Correct Answer:** D.