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
Downey cell is seen in - 
Select and explain. 
A. Myeloma, B. Chronic myeloid leukemia, C. Hairy cell leukemia, D. Infectious mononucleosis
D: Infectious mononucleosis
Answer: D: Infectious mononucleosis 
Explanation: None