Okay, let's tackle this question about dermoid cysts of the ovary. The question is asking which statements are true. The options are a) to e), and the correct answer is given as A, B, C, D, E. But the user hasn't specified which letters are correct. Wait, the correct answer here is probably the options a, b, e. Wait, no, let me think again.

First, I need to recall what a dermoid cyst is. Dermoid cysts are a type of ovarian cyst, right? They're also called mature cystic teratomas. So option a says it's a teratoma. That's correct because teratomas are germ cell tumors that can contain multiple tissue types. So a) is true.

Option b: Frequently undergo torsion. Ovarian cysts can cause torsion because the ovary can twist on its stalk. Since dermoid cysts are often large, they are indeed prone to torsion. So b) is correct.

Option c: X-ray is diagnostic. X-rays might show calcifications or fat, which are characteristic of dermoid cysts. The presence of fat and calcification on imaging (like CT) is diagnostic, but X-ray alone might not be sufficient. However, some sources say that plain X-ray can show fat, which is a clue. So maybe c) is correct. But I'm not sure if X-ray is the primary diagnostic tool here. Usually, ultrasound is the first-line imaging modality. So maybe c) is incorrect.

Option d: Invariably turns to malignancy. No, dermoid cysts are benign. They don't typically turn malignant unless there's some malignant transformation, which is rare. So d) is false.

Option e: Contains sebaceous material and hairs. Yes, because dermoid cysts contain tissues like skin, hair, sebaceous glands, etc. So e) is correct.

So the correct options are a, b, e. But the user's correct answer is not specified here. Wait, the original question lists a) to e), and the correct answer is given as A. B. C. D. but the user hasn't filled them. Wait, the user provided the correct answer as "Correct Answer: [Letter]. [Answer Text]", but the letters here are A to E. Let me check the original question again.

The options are a) is teratoma, b) torsion, c) X-ray diagnostic, d) malignancy, e) hair and sebaceous. The correct answer should be a, b, e. But maybe the options are presented as A to E with letters A to E corresponding to the options. Wait, the original question says "Correct Answer: [Letter]. [Answer Text]" but the user hasn't filled in the letters. Wait, maybe the correct answer is A, B, E. Let me check again.

Dermoid cysts are mature cystic teratomas (a is correct). They can cause torsion (b is correct). X-ray might show fat and calcification, but is it diagnostic? I think the definitive diagnosis is usually with imaging like ultrasound or CT, but X-ray can be part of the evaluation. So maybe c is incorrect. Option e is correct. So the correct answers are a, b, e. Therefore, the correct option letters would be A,

✓ Correct Answer: B. abce