This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vigina, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of the following is an example for Transplacental carcinogenesis? \nSelect and explain. \nA. Vaginal Ca, B. Pancreatic Ca, C. Colon Ca, D. Breast cancer', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ref: Shaw's Textbook of Gynaecology, 15th ed. pg :52 Explanation:Transplacental carcinogenesis is a series of genotypic or phenotypic changes in the cells of a fetus due to in utero exposure to carcinogens.Adenocarcinoma (clear cell carcinoma) was seen in the vagina in children whose mothers took Diethylstilbesterol for threatened abortion.", 'role': 'assistant'}]