This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'Tumors associated with infective etiology are all except \nSelect and explain. \nA. Nasopharyngeal ca, B. Hepatocellular ca, C. Non-small cell carcinoma lung, D. Gastric ca', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Nasopharyngeal carcinoma - Epstein-Barr virus Hepatocellular carcinoma - Hepatitis B virus Gastric carcinoma - H.pylori (gram positive spiral shaped bacteria)Reference : page 222 and 224 Textbook of pathology Harshmohan 6th edition', 'role': 'assistant'}]