This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Entropion is 
Select and explain. 
A. Inversion of eyelid, B. Inversion of eyelashes, C. Eversion of eyelid, D. Eversion of eyelashes
A: Inversion of eyelid
Answer: A: Inversion of eyelid 
Explanation: Entropion is a condition in which the lower eyelid turns inward, rubbing against the eye. Entropion occurs most commonly as a result of aging. Infection and scarring inside the eyelid are other causes of entropion.