This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary tract, Subject name: Pathology
[{'content': 'Renal cell carcinoma- \nSelect and explain. \nA. Invades Renal Vein, B. Hematuria usually absent, C. Arises from proximal convoluted tubule, D. More common in females', 'role': 'user'}, {'content': 'Answer: A \nExplanation: RCC commonly arise from the poles of the kidney as a solitary and unilateral tumor,more often in upper pole.The tumor has slight male preponderance(2:1).One significant characteristic is the presence of tumor thrombus in the renal vein which may extend into the vena cava.The clinical features include a triad of gross hematuria ,flank pain,palpable abdominal mass. From Textbook of pathology HarshMohan ,7th edition pg no:681,682', 'role': 'assistant'}]