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': 'True about dermoid cyst of ovary:a) It is teratomab) Frequently undergo torsionc) X-ray is diagnosticd) Invariably turns to malignancye) Contains sebaceous material and hairs \nSelect and explain. \nA. bcde, B. abce, C. acde, D. abde', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dermoid cyst: Dermoid cyst is a benign teratoma.\n– It is most common benign tumour of ovary in reproductive age group.\n– Most common benign neoplasm diagnosed during pregnancy.\nMost common Germ cell tumor.\nIt is the commonest tumor to undergo torsion.\n– Characteristically they are unilocular cyst containing hair and cheesy sebaceous material, teeth, bones, thyroid tissue and cartilage.\n– If teeth or bone are seen in X-ray in adnexal mass, this finding is pathognomic for teratoma and thus X-ray is diagnostic.\n– Malignant change in a dermoid cyst occurs in 0.5 – 2% cases in patients > 40 years. Most common malignancy which develops is, squamous cell carcinoma.', 'role': 'assistant'}]