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: Pathology
[{'content': 'Which type of malignant melanoma has worse prognosis \nSelect and explain. \nA. Nodular melanoma, B. Superficial spreading melanoma, C. Acral lentiginous melanoma, D. Lentigo maligna melanoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nodular melanoma is most aggressive and has worst prognosis,Well demarcated, smooth or nodular and pigmented tumour which may be\xa0amelanotic sometime.', 'role': 'assistant'}]