Chalazion is/are  a) True meibomian cyst  b) Mucous cyst  c) Sebaceous cyst  d) Cyst of hair follicle  e) Obstruction of meibomian gland: (A) ace, (B) abc, (C) abd, (D) bcd
Answer is A. Chalazion is chronic non-infective lipogranulomatous inflammation of meibomian gland, a modified sebaceous gland, due to obstruction of duct of meibomian gland.
Chalazion is also called sebaceous cyst of the eyelid.