<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 55-year-old man comes to the physician because of a 2-month history of headaches, facial numbness, recurrent epistaxis, and a 5-kg 11-lb weight loss. He recently immigrated from Hong Kong. Examination shows right-sided cervical lymphadenopathy. Endoscopy shows an exophytic nasopharyngeal mass. Histologic examination of a biopsy specimen of the mass shows sheets of undifferentiated cells with nuclear pleomorphism and abundant mitotic figures. The patient most likely acquired the causal pathogen of his nasopharyngeal mass via which of the following routes of transmission?? A: Sexual contact, B: Tick bite, C: Transfer of saliva, D: Fecal-oral, E: Mother to baby,  <response>: This is a clinical case about a 55-year-old man with symptoms of headaches, facial numbness, recurrent nosebleeds, weight loss, and enlarged cervical lymph nodes. He recently immigrated from Hong Kong. Endoscopy revealed a nasopharyngeal mass, and biopsy showed undifferentiated carcinoma. The key finding is that he immigrated from Hong Kong. Nasopharyngeal carcinoma is strongly associated with Epstein-Barr virus EBV infection. EBV is transmitted by transfer of saliva. Therefore, the most likely route of transmission for the causal pathogen is via saliva contact.Sexual contact, tick bite, fecal-oral route, and mother-to-baby transmission are not likely routes of EBV transmission.C: Transfer of saliva 