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
Which of the following anti-asthma drugs is NOT a bronchodilator ? 
Select and explain. 
A. Ipratropium bromide, B. Theophylline, C. Formoterol, D. Sodium cromoglycate
D: Sodium cromoglycate
Answer: D: Sodium cromoglycate 
Explanation: None