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: Gynaecology & Obstetrics
[{'content': "Bartholin's cyst is caused by: \nSelect and explain. \nA. Candida, B. Anaerobes, C. Gonococcus, D. Trichomonas", 'role': 'user'}, {'content': "Answer: C \nExplanation: Fluctuant non-tender swelling at the introitus suggests a diagnosis of bartholins cyst.\nBartholin's cyst:\n\nIt is the most common cyst of the vulva.\nBartholin's' cyst are produced from the accumulation of secretions of Bartholin's gland.\nThe cyst may develop either in the duct (more common) or in the gland\nEtiology: Cyst formation occurs due to the obstruction of the main duct or opening of an acinus.\nThe cause of obstruction is usually fibrosis which follows either infection or trauma.\nIt was formerly believed that the infection was invariably gonococcal but almost any organism can be responsible.\nLeft Bartholin' gland is more often affected than the right.\n\nPresentation\n\nUsually presents as a unilateral swelling that bulges across the vaginal introitus.\nSize of the cyst rarely exceeds hen's egg.\n\n\nSwelling is present characteristically on the inner side of the junction of the anterior 2/3rd with posterior 1/3rd of the labium majus.\nThe swelling is fluctuant and usually non-tender.\n\n\nThe patient may present with discomfort, dyspareunia, or infection.\n\nTreatment of choice is Marsupialization: It is preferred over traditional excision operations.", 'role': 'assistant'}]