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 an immuno-histological marker for \nSelect and explain. \nA. Melanoma, B. Schwannoma, C. Neurofibroma, D. Rhabdomyosarcoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: HMB - 45 is an immunohistological marker for Melanoma. Ref: Quick Reference Handbook for Surgical Pathologists By Natasha Rekhtman, Justin A. Bishop, Page 12; Harrison's Principles of Internal Medicine, 16th Edition, Pages 439, 563 and 17th Edition, Page 615", 'role': 'assistant'}]