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
Cusco's speculum is - 
Select and explain. 
A. Double bladed posterior vaginal speculum, B. Bivalve selfretaining vaginal speculum, C. Double bladed selfretaining posterior vaginal speculum, D. Bivalve double bladed vaginal speculum
B: Bivalve selfretaining vaginal speculum
Answer: B: Bivalve selfretaining vaginal speculum 
Explanation: Ans. is 'b' i.e., Bivalve self retaining vaginal speculumCusco's 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.