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: Physiology
Oily substance secreting gland is: September 2009 
Select and explain. 
A. Sweat gland, B. Meibomian gland, C. Salivary gland, D. Lacrimal gland
B: Meibomian gland
Answer: B: Meibomian gland 
Explanation: Ans. B: Meibomian glandThe meibomian glands (or tarsal glands) are a special kind of sebaceous glands at the rim of the eyelids inside the tarsal plate, responsible for the supply of meibum, an oily substance that prevents evaporation of the eye's tear film, prevents tear spillage onto the cheek, makes the closed lids aiight and acts as a blockade for tear fluid, trapping tears between the oiled edge and eyeball