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: ENT
[{'content': 'In which country is Nasopharyngeal carcinoma most commonly found? \nSelect and explain. \nA. India, B. China, C. Pakistan, D. Japan', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nasopharyngeal carcinoma is most common in China paicularly in southern states and Taiwan. Factors operative in China are burning of incense or wood(polycyclic hydrocarbon), use of preserved salted fish (nitrosamines) along with vitamin C deficient diet. Infection with Epstein Barr Virus also act as predisposing factor.', 'role': 'assistant'}]