This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pharmacology
Which of the following is not a bronchodilator 
Select and explain. 
A. Beta 2 agonist, B. Methylxanthines, C. Steroids, D. Anticholinergics
C: Steroids
Answer: C: Steroids 
Explanation: Classification: bronchodilators: beta 2 agonists anticholinergics and methylxanthines like caffeine and theophylline ref KD Tripathi 8th ed