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: Surgery
[{'content': 'Which of the following is the most common swelling of eyelids? \nSelect and explain. \nA. Chalazion, B. Neurofibromatosis, C. Rodent ulcer, D. Dermoid cyst', 'role': 'user'}, {'content': 'Answer: A \nExplanation: These are the most common lid swellings. A meibomian cyst is a chronic granulomatous inﬂammation\xa0 of a meibomian gland. It may occur on either upper or lower lids and presents as a smooth, painless\xa0 swelling. It can be felt by rolling the cyst on the tarsal plate.\nKey Concept:\nMeibomian cyst: They are epidermal cysts found on the free\xa0 edge\xa0 of\xa0 eyelid.\xa0\xa0\nChronic Meibomian cyst is called chalazion.', 'role': 'assistant'}]