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
Tiotropium is used for - 
Select and explain. 
A. Treating urinary retention, B. Treating ileus, C. Increasing salivation, D. Treating Asthma
D: Treating Asthma
Answer: D: Treating Asthma 
Explanation: Ans. is 'd' i.e., Treating Asthma o Ipratropium and tiotropium are anticholinergic bronchodilators.