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
Fastest method for diagnosis of TB ? 
Select and explain. 
A. Gene expe, B. LI medium, C. TB MGIT, D. BAC IEC
A: Gene expe
Answer: A: Gene expe 
Explanation: Ans. is 'a' i.e., Gene expe