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
[{'content': "Cusco's speculum is - \nSelect and explain. \nA. Double bladed posterior vaginal speculum, B. Bivalve selfretaining vaginal speculum, C. Double bladed selfretaining posterior vaginal speculum, D. Bivalve double bladed vaginal speculum", 'role': 'user'}, {'content': "Answer: B \nExplanation: 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.", 'role': 'assistant'}]