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
Immunohistochemistry of a sample shows HMB 45. It is a marker for the following malignancy? 
Select and explain. 
A. Sarcoma, B. Melanoma, C. Carcinoma, D. None of the above
B: Melanoma
Answer: B: Melanoma 
Explanation: Immunohistochemistry is a specialized form of histology employing antibodies to identify specific proteins within the tumor to allow for better differentiation of tumor type. Ceain immunohistochemical stains for neoplasms: Immunohistochemical Stain Neoplasms that Stain Positive Cytokeratin Carcinomas Desmin Benign and malignant neoplasms of smooth and skeletal muscle Glial fibrillary acidic protein (GFAP) Astrocytomas HMB-45 Melanoma Alpha fetoprotein (AFP) Hepatocellular carcinoma, yolk sac tumor Chromogranin A Small cell carcinoma Ref: Wyatt C., Kemp W.L., Moos P.J., Burns D.K., Brown T.G. (2008). Chapter 4. Neoplasia. In C. Wyatt, W.L. Kemp, P.J. Moos, D.K. Burns, T.G. Brown (Eds), Pathology: The Big Picture.