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
Ophthalmia neonatorum is caused by –a) Gonorrhoeab) H. Influenzaec) Chlamydiad) Pseudomonase) Staph. aureus 
Select and explain. 
A. acde, B. bde, C. abcd, D. abde
A: acde
Answer: A: acde 
Explanation: Causative organism of ophthalmia neonatorum :- Common causes are Gonococcus, Chlamydia, HSV.
Other causes are staphylococcus aureus, pneumococcus, streptococcus, pseudomonas, serratia, klebsiella.
Chemical ophthalmia neonatorum is caused by the use of silver nitrate or antibiotic prophylaxis.