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
In which of the following malignancies histological grade is a good prognostic indicator? 
Select and explain. 
A. Melanoma, B. Soft tissue sarcoma, C. Renal cell carcinoma, D. Lung cancer
B: Soft tissue sarcoma
Answer: B: Soft tissue sarcoma 
Explanation: None