Which of the following is an important etiological factor for nasopharyngeal carcinoma?

Ans. is 'b' i.e., Epstein Barr virusEtiology of Nasophary ngeal carcinomao Nasopharyngeal carcinoma is multifactorial in origin, the three risk factors are1) Genetic: Chinese have a higher genetic susceptibility to nasopharyngeal cancer. Even after migration to other countries2) Viral: Epstein- Bar virus is closely associated with nasopharyngeal cancer. Specific viral markers are being developed to screen people in high incidence areas.3) Environmental: Air pollution, smoking of tobacco and opium, nitrosamines from dry salted fish, smoke from burning of incense and wood have all been incriminated.