This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
Hardoleum internum is - 
Select and explain. 
A. Acute infection of Zeis gland, B. Acute infection of Moll gland, C. Acute infection Meibomian gland, D. Chronic infection of Zeis gland
C: Acute infection Meibomian gland
Answer: C: Acute infection Meibomian gland 
Explanation: Suppurative inflammation of meibomian gland associated with blockage of the duct. Ref:Ak khurana 6th edition REF IMG