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
[{'content': 'Most common carcinoma is associated with IVC metastasis \nSelect and explain. \nA. Small cell carcinoma lung, B. Gastric adenocarcinoma, C. Renal cell carcinoma, D. Papillary carcinoma thyroid', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans is 'c' i.e. Renal cell carcinoma The one of the striking characteristics of RCC is to invade renal vein and metastasize into IVC.Through bloodRenal cell carcinomaPheochromocytomaAdrenocoical carcinomaUterine sarcomas (Lemmyomatosis, endometrial stromal cell sarcoma)Germ cell tumors (embryonal, teratocarcinoma)Direct invasionRetroperitonel soft tissue tumors (hposarcoma, leipmyosarcoma, malignant fibrous histiosarcoma )Hepatic tumors (cholangiocarcinoma, HCC)Pancreaticodudenal tumor.", 'role': 'assistant'}]