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: Unknown
[{'content': 'Marker for malignant melanoma is- \nSelect and explain. \nA. Cytokeratin, B. MBN-45, C. Alpha FP, D. S 100', 'role': 'user'}, {'content': 'Answer: D \nExplanation: S 100', 'role': 'assistant'}]