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': 'All of the following statements hold true for melanoma of vulva except \nSelect and explain. \nA. It is the 2nd M/ C vulval cancer, B. M/C site is labia majora, C. May arise from junctional naevus, D. Has a poor prognosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]