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': "False about female pelvis: \nSelect and explain. \nA. Narrow' pelvic plane lies at the level of ischial spines, B. Plane of greatest pelvis dimension corresponds to SI & S2 vertebrae, C. Angle of inclination is 55deg, D. Plane of least pelvic dimension form plane of obstetrical outlet", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: B (Plane...) FEMALE PELVIS"For descriptive purpose, true pelvis is divided into inlet, cavity & outlet It is shallow in front, formed by symphysis pubis & measures 4 cm & deep posteriorly, formed by sacrum & coccyx & measures 11.5 cm"- Dutta\'s Obstetrics 6th/ 88"Pelvic cavity: The cavity is curved in such a way that it is first directed downwards & backwards, & then downwards & the forwards (J-shaped). It has unequal walls, measuring only about 5 cm anteriorly & 15 cm posteriorly" BDC4th/Vol. II-343"In the erect posture, the pelvis is tilted forward. As such, the plane of the inlet makes an angle of about 550 with the horizontal & is called angle of inclination"- Dutta\'s Obstetrics 6th/88"Plane of greatest pelvis dimension: The plane extends from the midpoint of posterior surface of symphysis pubis to the junction of the second & third sacral vertebrae"- Dutta\'s Obstetrics 6th/ 90"Obstetrical outlet: It is the segment of the pelvis bounded above by the plane of least pelvic dimensions & below by the anatomical outlet"- Dutta\'s Obstetrics 6th/ 91Plane of least pelvis dimension or narrow pelvic plane: The plane extend from the lower border of the symphysis pubis to the tip of ischial spines & posteriorly to meet the tip of fifth sacral vertebrae. It is irregularly oval & notched on each side by the ischial spine Dutta\'s Obstetrics 6th/ 91', 'role': 'assistant'}]