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': 'Gene expe used for getting diagnosis of TB in ? \nSelect and explain. \nA. 1-2 hrs, B. 5 hrs., C. 10 hrs., D. 20 hrs.', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 1-2 hrs. Results are obtained from unprocessed sputum samples in 90 minutes, with minimal biohazard and very little technical traning required to operate.", 'role': 'assistant'}]