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': 'Lesion in female child born to a mother treated with stilbesterol is : \nSelect and explain. \nA. Vaginal adenosis, B. Sarcoma Botyroides, C. Cervical erosion, D. Carcinoma endometrium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vaginal adenosis', 'role': 'assistant'}]