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
Leucopenia is characteristic of 
Select and explain. 
A. Appendicitis, B. Enteric fever, C. Meningitis, D. Myocardial Infarction
B: Enteric fever
Answer: B: Enteric fever 
Explanation: None