This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasympathetic System & Glaucoma, Subject name: Pharmacology
A drug 'X' belongs to the anticholinergic drug group. It is primarily used in pre anesthetic medication and also during surgery. Which of the following can be 'X'? 
Select and explain. 
A. Glycopyrrolate, B. Pipenzolate methyl bromide, C. Isopropamide, D. Dicyclomine
A: Glycopyrrolate
Answer: A: Glycopyrrolate 
Explanation: Glycopyrrolate is potent and rapidly acting antimuscarinic and do not have central effects It is used to reduce the secretions during anaesthesia (to prevent reflex bronchospasm). It is mainly used as pre-anaesthetic medication.