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
Pseudomembranous conjunctivitis is caused by – a) Gonococcusb) Staphylococcusc) Streptococcusd) Keratoconjunctivitis sicca 
Select and explain. 
A. abc, B. bc, C. acd, D. bcd
A: abc
Answer: A: abc 
Explanation: Bacteria causing pseudomembranous conjunctivitis are corynebacterium diphtheriae, staphylococci, streptococci, H. influenzae, N. gonorrhoea.