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: Microbiology
A patient with sore throat has a positive Paul Bunnell test. The causative organism is: 
Select and explain. 
A. EBV, B. Herpes virus, C. Adenovirus, D. Cytomegalovirus
A: EBV
Answer: A: EBV 
Explanation: None