<prompt> Nasopharyngeal Ca is caused by:EBVPapilloma virusParvo virusAdeno virus  <response>: Etiology of Nasopharyngeal Carcinoma Genetic: It is most common in China. Viral: Epstein-Barr virus is closely associated with nasopharyngeal cancer. Epstein-Barr virus has identified in tumor epithelial cells not lymphocytes of most undifferentiated and nonkeratinizing squamous cell carcinoma. Environmental: Burning of incense or wood polycyclic hydrocarbon; smoking of tobacco and opium; air pollution; nitrosamines from dry salted fish along with vitamin C deficient diet have been linked to the etiology of nasopharyngeal cancer. 