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 drug is not indicated by oral route of administration in pregnancy - 
Select and explain. 
A. Salbutamol, B. Prednisolone, C. Theophylline, D. Ipratropium bromide
D: Ipratropium bromide
Answer: D: Ipratropium bromide 
Explanation: Ans. is 'd' i.e., Ipratropium bromide o Ipratropium, if used is administered only by inhalation route, not orally.