This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'In which of the following malignacies histological Grade is a good prognostic indicator? \nSelect and explain. \nA. Soft tissue sarcoma, B. Renal cell carcinoma, C. Papillary Thyroid carcinoma, D. Hepatoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Heterogenous group of rare malignant tumours. Combining histological parameters-no of mitosis per eyefield, presence of necrosisi. Cellular and nuclear morphology. Tumour differentiation and neurotic index. Assess the risk of metastasis.', 'role': 'assistant'}]