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
In which country is Nasopharyngeal carcinoma most commonly found? 
Select and explain. 
A. India, B. China, C. Pakistan, D. Japan
B: China
Answer: B: China 
Explanation: 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.