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
The commor'est cause of hypopyon is: 
Select and explain. 
A. Moraxella, B. Gonococcus, C. Pneumococcus, D. Staphylococcus
C: Pneumococcus
Answer: C: Pneumococcus 
Explanation: Ans. Pneumococcus