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': 'Fastest method for diagnosis of TB ? \nSelect and explain. \nA. Gene expe, B. LI medium, C. TB MGIT, D. BAC IEC', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Gene expe", 'role': 'assistant'}]