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
Which is the most common type of ovarian cyst to undergo torsion? 
Select and explain. 
A. Dysgerminoma, B. Serous cystadenoma, C. Benign cystic teratoma, D. Mucinous cystadenoma
C: Benign cystic teratoma
Answer: C: Benign cystic teratoma 
Explanation: 80% of ovarian masses are benign cystic teratomas or dermoid cysts. It mainly occur during the reproductive years, but have a wider age distribution. It is associated with a 15% risk of torsion, and is the most common type of ovarian cyst to undergo torsion. Other complications associated with it are, cystic rupture resulting in acute peritonitis and chronic leakage of teratoma contents resulting in granulomatous peritonitis. Ref: Textbook of gynecology by D C Dutta 4th edition Page 273-5, 352.