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': 'Prolong latent phase is/are seen in:a) Placenta praeviab) Unripe cervixc) Abruptio placentae d) Excessive sedatione) Early epidural analgesia \nSelect and explain. \nA. abc, B. ade, C. ace, D. bde', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]