This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Forensic Medicine
[{'content': 'All are Atropine substitutes except \nSelect and explain. \nA. Procyclidine, B. Propantheline, C. Tiotropium, D. Drotaverin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Drotaverine (INN, also known as drotaverin) is an antispasmodic drug, used to enhance cervical dilation during childbih. It is structurally related to papaverine, is a selective inhibitor of phosphodiesterase 4, and has no anticholinergic effects. Ref - medscape.com', 'role': 'assistant'}]