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 is a long acting M3 - antagonist used for bronchial asthma 
Select and explain. 
A. Ipratropium, B. Glycopyrolate, C. Cromoglycate, D. Tiotropium
D: Tiotropium
Answer: D: Tiotropium 
Explanation: Tiotropium and umiclidinium are longer acting M3-antagonists used in bronchial asthma.