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
Factors responsible for the development of multidrug resistant pneumonia are all, EXCEPT: 
Select and explain. 
A. Widespread use of potent oral antibiotics, B. Earlier transfer of patients out of acute-care hospitals to their homes, C. Increased use of outpatient IV antibiotic therapy, D. Underlying lung cancer
D: Underlying lung cancer
Answer: D: Underlying lung cancer 
Explanation: Factors responsible for the development of multidrug resistant pneumonia are Widespread use of potent oral antibiotics Earlier transfer of patients out of acute-care hospitals to their homes or various lower-acuity facilities Increased use of outpatient IV antibiotic therapy General aging of the population More extensive immunomodulatory therapies Ref: Harrison, E-18, P-2130.