<prompt> Which of the following ovarian tumour is most prone to undergo torsion during pregnancy?Serous cystadenomaMucinous cystadenomaDermoid cystTheca lutein cyst  <response>: Incidence of dermoid cyst increases two times in pregnancy and it becomes the most commonly diagnosed ovarian tumour during pregnancy.Dutta Obs. 7e, p 310A benign cystic teratoma is the most common neoplasm to undergo torsion.Novak 14e, p 510 