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': 'Deep transverse arrest is most commonly seen in: \nSelect and explain. \nA. Android pelvis, B. Gynaecoid pelvis, C. Flat pelvis, D. Anthropoid pelvis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Android pelvis', 'role': 'assistant'}]