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
[{'content': 'which of this following can be used as a pre-anaesthetic medication to decrease the secretions and reflux bronchospasm during general anaesthesia: \nSelect and explain. \nA. Ipratropium., B. Tiotropium., C. Glycopyrrolate., D. Atropine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]