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': 'HMB 45 is tumor marker for ? \nSelect and explain. \nA. Malignant melanoma, B. Mesothelioma, C. Bronchogenic carcinoma, D. Pancreatic carcinoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Malignant melanoma", 'role': 'assistant'}]