**Core Concept:** Sodium Cromoglycate is a bronchodilator used as a preventive medication for asthma management. It inhibits leukotriene synthesis, a key mediator in asthma pathogenesis.

**Why the Correct Answer is Right:** Sodium Cromoglycate, also known as cromolyn, is a leukotriene synthesis inhibitor. It works by blocking the action of leukotrienes, which are potent inflammatory mediators involved in asthma pathogenesis. By suppressing leukotriene production, Sodium Cromoglycate helps reduce airway inflammation, constriction, and hyperresponsiveness in asthmatic patients.

**Why Each Wrong Option is Incorrect:**

A. **Incorrect:** Sodium Cromoglycate does not act as a bronchodilator directly, which is why it is not an option. Bronchodilators like salbutamol (salbutamol) are direct-acting medications that relax smooth muscle to relieve bronchospasm.

B. **Incorrect:** Although Sodium Cromoglycate does inhibit leukotriene synthesis, it is not a selective inhibitor of leukotriene receptors (LTRA). Selective leukotriene receptor antagonists (LTRAs) like Montelukast target and block leukotriene receptor subtypes LTD4 and LTE4, while Sodium Cromoglycate acts upstream to inhibit the synthesis of leukotrienes.

C. **Incorrect:** Sodium Cromoglycate does not function as a phosphodiesterase inhibitor (PDE inhibitor). PDE inhibitors like Sildenafil are used for erectile dysfunction treatment, while Sodium Cromoglycate targets leukotriene synthesis.

D. **Incorrect:** Although Sodium Cromoglycate is an anti-inflammatory agent, it is not a corticosteroid. Corticosteroids like Prednisolone possess anti-inflammatory properties and are used for asthma management; Sodium Cromoglycate acts on a different aspect of asthma pathogenesis.

**Clinical Pearl:** Sodium Cromoglycate is an example of a leukotriene synthesis inhibitor, demonstrating the importance of understanding the specific mechanisms of action of different asthma medications for effective asthma management and treatment selection.