This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: ENT
EBV is associated with. 
Select and explain. 
A. Nasopharyngeal carcinoma, B. Esophageal cancer, C. Gastric cancer, D. None of the above
A: Nasopharyngeal carcinoma
Answer: A: Nasopharyngeal carcinoma 
Explanation: Epstein-Barr Virus (EBV)is closely associated with nasopharyngeal cancer. EB virus has two impoant antigens:Viral capsid antigen(VCA) andEarly antigen(EA). IgA antibodies of EA are highly specific for nasopharyngeal cancer but have sensitivity of only 70-80% while IgA antibodies of VCA are more sensitive but less specific. IgA antibodies against both EA and VCA should be done for screening of patients for nasopharyngeal cancer.