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
The most impoant prognostic indicator of mesenchymal tumour is - 
Select and explain. 
A. Type of primary, B. Type of primary, C. Size, D. Site
B: Type of primary
Answer: B: Type of primary 
Explanation: Ans. is 'b' i.e., Grade