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': 'Second stage of labour is from: \nSelect and explain. \nA. Onset of contraction to rupture of membranes, B. Onset of contractions to full dilation, C. Rupture of membranes to delivery of fetus, D. Full dilatation to delivery of fetus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Full dilatation to delivery of fetus', 'role': 'assistant'}]