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': 'Term delivery implies that the gestational age of the foetus calculated from the time of onset of last menstrual period is : \nSelect and explain. \nA. 40 weeks, B. 42 weeks, C. 38 weeks, D. 260 days', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 40 weeks', 'role': 'assistant'}]