This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
Best way to prevent infection after cataract surgery is - 
Select and explain. 
A. Antibiotics, B. Yebrows shaving, C. Through irrigation, D. None of the above
A: Antibiotics
Answer: A: Antibiotics 
Explanation: The most impoant source of potentil infectious organisms is the patient's own natural conjunctival and skin flora. So, prophylactic antibiotic should adequately cover these organisms. The pre- operative topical antibiotic should be staed 3 days prior to sugery. Preferred antibiotics are fouh generaion fluoroquinolones (gatifloxacin, moxifloxacin). Other antibiotics are aminoglycosides, traditional fluoroquinolones (ciprofloxacin, levofloxacin) and gramicidin- neomycin - polymyxin B combinatin. (Ref: Yanoff; Jay S. Duker 2009 Ophthalmology 3rd/e p.416-419)