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': 'Gynaecological cancer unusual in young women: \nSelect and explain. \nA. Cancer ovary, B. Cancer cervix, C. Cancer vulva, D. Choriocarcinoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cancer vulva', 'role': 'assistant'}]