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 not given in ophthalmia neonatorum – \nSelect and explain. \nA. Erythromycin locally, B. Tetracycline 1%, C. Penicillin locally, D. Silver nitrate', 'role': 'user'}, {'content': "Answer: D \nExplanation: Prophylactic use of 1% silver nitrate (Crede's method) is obsolete now.\nErythromycin and tetracycline ointment are frequently used for prophylaxis. Penicillin is used for treatment of sensitive strains of gonococci.", 'role': 'assistant'}]