<prompt> Cuscos speculum is -Double bladed posterior vaginal speculumBivalve selfretaining vaginal speculumDouble bladed selfretaining posterior vaginal speculumBivalve double bladed vaginal speculum  <response>: Ans. is b i.e., Bivalve self retaining vaginal speculumCuscos self-retaining bivalved speculum is a surgical instrument used for vaginal and cervical examinationIt limits the visualization of the vaginal walls.It is used to visualize the cervix and the vaginal fornixes for the local cause of APH.It is also used for minor procedures like pap smear and IUCD inseion.It is also used to detect the leakage of liquor from the cervical os in case of suspected PROM. 