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
Dermoid cyst is a form of 
Select and explain. 
A. Cystic hamartoma, B. Cystic teratoma, C. Choriostoma, D. Hamartoma
B: Cystic teratoma
Answer: B: Cystic teratoma 
Explanation: None