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
All of the following organisms are known to survive intracellularly except - 
Select and explain. 
A. Neisseria meningitidis, B. Salmonella typhi., C. Streptococcus pyogenes, D. Legionella pneumophila
C: Streptococcus pyogenes
Answer: C: Streptococcus pyogenes 
Explanation: Facultative intracellular organisms 


Besides obligate intracellular organisms, some other organisms can live intracellularly → Facultative intracellular organisms.



These bacteria also have the capability of synthesis their own ATP, So they usually live extracellularly (in contrast obligate intracellular organisms).
These bacteria are phagocytosed by the host's macrophages and neutrophils yet survived within these WBCs by inhibiting phagosome-lysosome fusion, thus escaping host's toxic H2O2 and superoxide radicals.
Important examples :-


Listeria monocytogenes  - Yersinia                     - Brucella         - Mycobacterium
Neisseria                         - Salmonella typhi       - Legionella     - Francisella tularensis