This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Labour, Subject name: Gynaecology & Obstetrics
[{'content': 'A forceps rotation of 30degfrom left occiput anterior (OA) to OA with extraction of the fetus from +2 station would be described as which type of delivery? \nSelect and explain. \nA. Outlet forceps, B. Low forceps, C. Mid-forceps, D. High forceps', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In the late 1980s and early 1990s, the classic definitions of forceps deliveries were slightly altered to conform with obstetric reality and the need for realistic definitions of procedures vis-a-vis both medical and legal guidelines and standards. Outlet forceps delivery requires a visible scalp, the fetal skull on the pelvic floor, the sagittal suture in essentially OA position, and the fetal head on the perineum. A rotation can occur, but only up to 45deg. A low forceps delivery requires a station of at least +2 but not on the pelvic floor. Rotation can be more than 45deg. Mid-forceps delivery is from a station above +2, but with an engaged head. High forceps delivery, for which there are no modern indications, would reflect a head not engaged.', 'role': 'assistant'}]