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': 'Outlet forceps, meansa) Head at station "0"b) Full cervical dilatationc) Rupture of membraned) Rotation > 45 \nSelect and explain. \nA. a, B. c, C. ac, D. bc', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]