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
Conditions predisposing to leukemia include all except - 
Select and explain. 
A. Ionising radiation, B. Myelofibrosis, C. Infectious mononucleosis, D. Polycythemia vera
C: Infectious mononucleosis
Answer: C: Infectious mononucleosis 
Explanation: None