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': 'Trial of labour is given in minimal contraction of : \nSelect and explain. \nA. Brain, B. Midcavity, C. Inlet, D. Moderate contracted pelvis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Inlet', 'role': 'assistant'}]