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
Most immunogenic in 
Select and explain. 
A. 0 antigen, B. H antigen, C. Vi antigen, D. Somatic antigen
B: H antigen
Answer: B: H antigen 
Explanation: Ans. is 'b' i.e., H. antigen