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
Distichiasis means 
Select and explain. 
A. Increased number of eyelashes in the lower lid, B. Second row of eyelashes, C. Increased thickness of eyelashes, D. Increased pigmentation of eyelashes
B: Second row of eyelashes
Answer: B: Second row of eyelashes 
Explanation: Distichiasis: Congenital distichiasis: It is a rare anomaly in which an extra row of cilia occupies the position of Meibomian glands which open into their follicles as ordinary sebaceous glands. These cilia are usually directed backwards and when rubbing the cornea, should be electroepilated or cryoepilated. Acquired distichiasis (metaplastic lashes): occurs when due to metaplasia and differentiation, the meibomian glands are transformed into hair follicles. The most impoant cause is late stage of cicatrizing conjunctivitis associated with chemical injury, Stevens-Johnson syndrome and ocular cicatricial pemphigoid. Ref:- A K KHURANA; pg num:-342,343