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
Zero growth rate is observed during one of the phases of the bacterial growth curve: 
Select and explain. 
A. Lag, B. Exponential growth, C. Stationary phase, D. Decline
C: Stationary phase
Answer: C: Stationary phase 
Explanation: None