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
ELISA is an extremely good screening test with a sensitivity of > 99.5 % While ELISA is an extremely sensitive test, it is not optimal with regard to specificity. 
Select and explain. 
A. ELISA, B. Agglutination test, C. CFI, D. All
A: ELISA
Answer: A: ELISA 
Explanation: Ans. is 'a' i.e., ELISA Most sensitive test --> ELISA Most specific test Western blot