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
Which of the following Conjunctivitis can also involve intact cornea? 
Select and explain. 
A. Acute mucopurulent conjunctivitis, B. Acute membranous conjunctivitis, C. Acute purulent conjunctivitis, D. Angular conjunctivitis
C: Acute purulent conjunctivitis
Answer: C: Acute purulent conjunctivitis 
Explanation: Acute purulent conjunctivitis caused by Gonococci. Gonococus can penetrate intact cornea.