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
Chalazion is: 
Select and explain. 
A. Chronic inflammation of meibomian gland, B. Acute inflammation of meibomian gland, C. Inflammation of Zeis gland, D. None
A: Chronic inflammation of meibomian gland
Answer: A: Chronic inflammation of meibomian gland 
Explanation: Chronic inflammation of meibomian gland