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: Dental
[{'content': 'Which of the following melanoma carries the worst prognosis? \nSelect and explain. \nA. Lentigo Maligna, B. Lentigo Maligna melanoma, C. Superficial spreading type, D. Nodular Melanoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Nodular Melanoma characterized by verticle or down growth of melanoma cells, and carries the worst prognosis.', 'role': 'assistant'}]