This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Paul Bunnel antibodies are reactive in all except - 
Select and explain. 
A. Ox, B. Sheep, C. Dog, D. Horse
A: Ox
Answer: A: Ox 
Explanation: Paul Bunnell antibodies agglutinate sheep erythrocyte, horse and dog REF:ANANTHANARYANAN TEXTBOOK OF MICROBIOLOGY 9EDITION PGNO.476