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': 'Which of the following is the most impoant factor in the prevention of the endophthalmitis is cataract surgery? \nSelect and explain. \nA. Preoperative prepaion with povidone iodine, B. One week antibiotic therapy prior to sugery, C. Trimming of eyelashes, D. Use of intravitreal antibiotics', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Preoperative preparation with povidone iodine', 'role': 'assistant'}]