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
[{'content': 'Longest lag period in bacterial growth is associated with ? \nSelect and explain. \nA. Rifampicin, B. INH, C. Streptomycin, D. Ethambutol', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Ethambutol", 'role': 'assistant'}]