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': 'Elderly primi is above : \nSelect and explain. \nA. 30 years, B. 35 years, C. 37 years, D. 45 years', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 30 years', 'role': 'assistant'}]