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': "All of the following are features of obstructed labour, except : \nSelect and explain. \nA. Hot dry vagina, B. Bandl's Ring, C. Unruptured membranes present, D. Tonic contracted uterus", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Unruptured membranes present', 'role': 'assistant'}]