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: Biochemistry
Antigen antibody reaction is detected by -a) ELISAb) Southern Blot c) Northern Blotd) Western Blot e) Eestern Blot 
Select and explain. 
A. b, B. c, C. ad, D. ab
C: ad
Answer: C: ad 
Explanation: Antigen-antibody reactions are detected by- Precipitation/flocculation tests, agglutination tests, neutralization tests, complement fixation tests (CFT), western blotting (immunoblotting), ELISA, and radioimmunoassay (RIA).