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: Medicine
While handling a febrile neutropenic patient all are essential except - 
Select and explain. 
A. Repeated hand washing of hospital person, B. White cell infusion, C. Prophylactic antibiotic, D. Colony stimulating factor for macrophages
B: White cell infusion
Answer: B: White cell infusion 
Explanation: None