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 20 year old male with history of fever and enlarged lymphnodes and sore throat, suspected to have infections mononucleosis and was ordered a Paul Bunnel test. What is the principle of the test: 
Select and explain. 
A. Heterophile agglutination test, B. Neutralization test, C. Complement fixation test, D. Agglutination reaction
A: Heterophile agglutination test
Answer: A: Heterophile agglutination test 
Explanation: Ans. (a) i.e. Heterophile agglutination test