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: Pathology
Infectious mononucleosis is caused by? 
Select and explain. 
A. EBV, B. CMV, C. HIV, D. HSV
A: EBV
Answer: A: EBV 
Explanation: Epstein-Barr virus (EBV) infections (or HHV-4) is causative for following infections:

Infectious mononucleosis
Nasopharyngeal carcinoma
Burkiu's lymphoma
Oral hairy leukoplakia
Post-transplant lymphoproliferative diseases