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
[{'content': 'For uniform staining reaction, morphology and biochemical activity, it is advisable to study bacterial cultures during the: \nSelect and explain. \nA. Lag phase, B. Death phase, C. Stationary phase, D. Logarithmic phase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]