This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, Subject name: Ophthalmology
Ophthalmia neonatorum is caused by 
Select and explain. 
A. Gonorrhea, B. Staphylococcus aureus, C. Chlamydia, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Other causes of ophthalmia neonatorum are herpes simplex and chemical conjunctivitis Refer: Khurana 6th edition page number76