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: Ophthalmology
[{'content': 'Frequent changes of reading glasses in a 60yr old male patient is a feature of \nSelect and explain. \nA. Primary open angle glaucoma, B. Senile nuclear cataract, C. Acute angle closure glaucoma, D. Presbyopia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Frequent changes of reading glasses is a feature of\xa0Primary open angle glaucoma.', 'role': 'assistant'}]