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': 'All of the following may cause cycloplegia except ? \nSelect and explain. \nA. Atropine, B. Cyclopentolate, C. Physostigmine, D. Tropicamide', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Physostigmine o Cycloplegia means paralysis of ciliary muscles of eye. o Cholinergic drugs (physostigmine) cause contraction of ciliary muscle --> cyclospasm (not cycloplegia). o Anticholinergic drugs (Atropine, cyclopentolate, Tropicamide) cause relaxation of ciliary muscles -3 Paralysis of ciliary muscles.", 'role': 'assistant'}]