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': 'In a primigravida, head engages at: March 2013 \nSelect and explain. \nA. 36 weeks, B. 1st stage, C. Term, D. 2nd stage', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. 36 weeks', 'role': 'assistant'}]