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
Gene expe used for getting diagnosis of TB in ? 
Select and explain. 
A. 1-2 hrs, B. 5 hrs., C. 10 hrs., D. 20 hrs.
A: 1-2 hrs
Answer: A: 1-2 hrs 
Explanation: 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.