This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
In bronchial asthma the mechanism of action of corticosteroids is : 
Select and explain. 
A. Relax airway smooth muscle directly, B. Inhibits mast cell deregulation, C. Inhibits adenosine receptors, D. Inhibits lymphocytic eosinophilic mucosal inflammation
D: Inhibits lymphocytic eosinophilic mucosal inflammation
Answer: D: Inhibits lymphocytic eosinophilic mucosal inflammation 
Explanation: None