This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'Which cardinal movements occur during labour : \nSelect and explain. \nA. Flexion, B. Extension, C. Internal rotation, D. all of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: There are 7 cardinal movements of head in normal labour: 1.Engagement 2.Descent 3.Flexion 4.Internal rotation 5.Extension 6.Restitution 7.External rotation. Refer page no 102 of Text book of obstetitics,sheila balakrishnan,2nd edition.', 'role': 'assistant'}]