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': 'The age of gestation when ovaries and testis are first distinguishable : \nSelect and explain. \nA. 4weeks, B. 8 weeks, C. 12 weeks, D. 16 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 8 weeks', 'role': 'assistant'}]