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
Chronic, sterile inflammation of meibomian gland is seen in: September 2010 
Select and explain. 
A. External hordeolum, B. Internal hordeolum, C. Chalazion, D. Stye
C: Chalazion
Answer: C: Chalazion 
Explanation: Ans. C : Chalazion A hordeolum, or stye, is an acute, localized, pyogenic (usually staphylococcal) infection or abscess of the eyelid that may be external or internal. Most hordeola are external and result from obstruction and infection of an eyelash follicle and adjacent glands of Zeis or Moll's glands. Follicle obstruction may be associated with blepharitis. An internal hordeolum, which is very rare, results from suppurative inflammation of a meibomian gland. Sometimes cellulitis accompanies hordeola Chalazion/Meibomian or Tarsal cyst is chronic, sterile and lipogranulomatous inflammation of meibomian gland.