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: Pharmacology
The primary reason for the use of drug combination in the treatment of tuberculosis is to : 
Select and explain. 
A. Ensure patient compliance with the drug regimen, B. Enhance activity against metabolically inactive mycobacteria, C. Delay or prevent the emergence of resistance, D. Provide prophylaxis against other bacterial infections
C: Delay or prevent the emergence of resistance
Answer: C: Delay or prevent the emergence of resistance 
Explanation: None