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': 'The most important action of beta-blockers in glaucoma is which of the following: \nSelect and explain. \nA. Membrane stabilizing effect, B. Retinal neuron protecting effect, C. Decrease in the production of aqueous humor, D. Pupillary constriction', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]