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
Anaerobic bacteria grow 
Select and explain. 
A. in the presence of oxygen, B. in the presence of nitrogen, C. in the absence of oxygen, D. differential media
C: in the absence of oxygen
Answer: C: in the absence of oxygen 
Explanation: None