This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ovarian Tumors and Vulvar cancer, Subject name: Gynaecology & Obstetrics
[{'content': 'The most common histological type of vulval cancer is? \nSelect and explain. \nA. Columnar cell carcinoma, B. Transitional cell carcinoma, C. Adenocarcinoma, D. Squamous cell carcinoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Squamous cell carcinoma is the most frequent form of cancer of the vulva. Squamous 92 % Melanoma 2-4 % Basal cell 2-3 % Baholin 1%', 'role': 'assistant'}]