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: Anatomy
[{'content': 'The following statements are related to occipito posterior except \nSelect and explain. \nA. Malrotation of occiput may cause occipito sacral arrest, B. 10% cases are associated with anthrapoid or android pelvis, C. Incomplete forward rotation of occiput may cause deep transverse arrest, D. Non rotation of occiput may cause are associated', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In more than 50% the occipito posterior position is associated with either anthrapoid or android pelvis', 'role': 'assistant'}]