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: Microbiology
Neutrophil count below which there is increased risk of nosocomial invasive pulmonary aspergillosis - 
Select and explain. 
A. < 4000/4, B. < 3000/4, C. < 2000/4, D. < 1000-500/RL
D: < 1000-500/RL
Answer: D: < 1000-500/RL 
Explanation: Ans. is 'd' i.e., < 1000-500/RL Invasive aspergillosis is a severe respiratory infection with a moality rate of over 90% in neutropenic patients.It is most often encountered in patients with absolute neutrophil counts of <500/4 from leukemia or chemotherapy.Patients undergoing bone marrow transplantation are susceptible to a greater extent than patients with hea, kidney, or liver transplants.