This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetal Skull and Maternal Pelvis, Subject name: Gynaecology & Obstetrics
[{'content': 'If both the ala of the sacral bone are absent, pelvis is called as: \nSelect and explain. \nA. Naegele pelvis, B. Robert pelvis, C. Triradiate pelvis, D. Rachitic pelvis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is b, i.e. Robert pelvisRef. Dutta Obs. 9/e, p 326If one ala is absent-pelvis is called Naegle's pelvis.If both ala of succumb are absent-pelvis is called as Robert's pelvis.Both are varieties of contracted pelvis and in both cesarean section is done.", 'role': 'assistant'}]