This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormal labor, Subject name: Gynaecology & Obstetrics
[{'content': 'The following statements are related to occipitoposterior except \nSelect and explain. \nA. malrotation of occiput may cause occipitosacral arrest, B. 10% cases are associated with anthropoid or android pelvis, C. Incomplete forward rotation of occiput may cause deep transverse arrest, D. Nonrotation of occiput may cause are associated', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Occipitoposterior position The occiput is in the posterior segment of pelvis ,over lying the sacroiliac joint or the sacrum.Occipitoposterior position is responsible for most cases of prolonged labour and second stage delay and is the most common cause of a mobile head at term (refer pgno:365 Sheila textbook of obstetrics 2 nd edition)', 'role': 'assistant'}]