This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
IgA protease in not needed in infection of: 
Select and explain. 
A. Gonococci, B. Meningococci, C. S.pneumonia, D. H.influenza
C: S.pneumonia
Answer: C: S.pneumonia 
Explanation: Ans: c and d Ref:Ananthanarayan, 7th ed, p. 335,218; Harrison, 16th ed, p. 806, 864Both S. pneumonia and H. influenza do not have IgA protease.Now it is upto you to decide.Bacteria showing antigenic variationBorrelia recurrentisTrypanosoma bruziNeisseriaGroup A streptococci