This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'All of the following are anticholinergics except: \nSelect and explain. \nA. Ipratropium bromide, B. Dicyclomine, C. Atropine, D. Amphetamine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref: KD Tripathi pharmacology 7th edition (page.no: 113) Anticholinergic drugs classification: 1. Natural alkaloids - Atropine, Hyoscine (Scopolamine). 2. Semisynthetic derivatives ;Homatropine, Atropine methonitrate, Hyoscine butyl bromide, Ipratropium bromide, Tiotropium bromide. 3. Synthetic compounds (a) Mydriatics: Cyclopentolate, Tropicamide b) Antisecretory-antispasmodics: (i) Quaternary compounds: Propantheline, Oxyphenonium, Clidinium, Pipenzolate, methyl bromide, Isopropamide, Glycopyrrolate. (ii) Teiary amines: Dicyclomine, Valethamate,Pirenzepine. (c) Vasicoselective: Oxybutynin, Flavoxate,Tolterodine. (d) Antiparkinsonian: Trihexyphenidyl (Benzhexol), Procyclidine, Biperiden. Amphetamine is adrenergic drug', 'role': 'assistant'}]